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trunk mount battery diagram #1561740 01/11/14 03:08 AM 01/11/14 03:08 AM
Joined: Apr 2003 Posts: 989 spokane/pullman Wa R ryanf OP super stock
ryanf OP super stock R Joined: Apr 2003 Posts: 989 spokane/pullman Wa	Hello, i am trying to mount my battery in the trunk and the attached diagram is what i came up with after reading/reviewing other diagrams. This will be mostly a street car with a little strip. One wire 100a alternator. Thoughts/opinions? Sorry for the crude diagram 7993340-BatteryDiagram.png (16650 downloads)

Re: trunk mount battery diagram [Re: ryanf] #1561741 01/11/14 11:16 AM 01/11/14 11:16 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Thoughts and opinions... I prefer to keep it simple. With careful cable routing I see no need for the added relay. I just ran heavy gauge cable ("0" I believe) from the starter to the back. 6 gauge from the starter to fender relay to feed the rest of the car. With the disconnect, you need to run the alternator lead to the back also, battery side of the disconnect. 6 gauge should do it with 125-150 amp breaker or fuse. If you are running lots of electrical load - accessories, big fan, ect 4 gauge for the charge wire would help reduce voltage drop. I routed my cable under the car on the drivers side - similar to factory fuel line routing on the pass side. I grounded to the trunk floor through a brace under the floor to get more meat... then later added a 1 gauge ground wire from the battery to the engine block. Front chassis ground ran from the left fender apron just above the rail so I caught the heavier lip of the rail. Starting current can be quite heavy... up to 300-400 amps? I don't think that breaker in the start circuit would take it and don't see the need for a breaker. A 200 amp switch can probably take it for the short time needed to get started. I got the heavy gauge wire and terminals from NAPA. Good luck!

Re: trunk mount battery diagram [Re: ryanf] #1561742 01/11/14 12:56 PM 01/11/14 12:56 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Using large welding cable which by its nature its insulation is thick/heavy duty. Batt neg post to good ground in trunk (down to subframe recommended). Batt positive post directly up front under the carpet to the starter big "batt" lug (no trunk solenoid). A lead from the starter batt lug to the starter relay and from the starter relay to the alt. Power everything up front (switched power) from the batt lug on the starter relay to the ign sw just like normal. Back in the trunk put the on/off switch in either the positive or the neg cable. Use appropriate fuses/circuit breakers as desired (I do not). IF a person uses a trunk solenoid & it is going to be energized all the time get a "continuous duty" unit rather than a common parts house furd solenoid & it'd probably be a good idea to use a continious duty one either way just for longevity. (trunk solenoid aside) Just me, this keeps it simple with the only change being that the batt is now sitting in the trunk rather than sitting up front & there's the longer cable needed to reach it. I dont sweat having the cable under the carpet hot all the time (welding cable insulation is thick) & I do keep it away from any sharp edges that could fray it over time & that is a good use for black electrical tape. EDIT if keeping the ammeter, put the ammeter in series between the starter big "batt" lug and the big "batt" stud on the starter relay that's on the fender/firewall. MORE EDIT If not using a trunk solenoid run a lead (like OE) from the "st" terminal on the ign sw out to the "ign" terminal on the starter relay & a lead from the "sol" terminal on the starter relay down to the small terminal on the starter/solenoid Last edited by RapidRobert; 01/11/14 03:26 PM.

Re: trunk mount battery diagram [Re: ryanf] #1561743 01/11/14 05:53 PM 01/11/14 05:53 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Not what I would do. You have to watch amp ratings on those 4 pole switches.

Re: trunk mount battery diagram [Re: RobX4406] #1561744 01/11/14 06:46 PM 01/11/14 06:46 PM
Joined: Apr 2003 Posts: 989 spokane/pullman Wa R ryanf OP super stock
ryanf OP super stock R Joined: Apr 2003 Posts: 989 spokane/pullman Wa	Quote: Not what I would do. You have to watch amp ratings on those 4 pole switches. Thanks for the replies, but if i want to take it to the track dont i have to be able to kill the engine with the switch? How would you wire it? i was looking at this relay https://www.ase-supply.com/Cole_Hersee_24213_12V_p/ch-24213.htm and this switch http://www.summitracing.com/parts/gfr-3103/overview/

Re: trunk mount battery diagram [Re: ryanf] #1561745 01/11/14 07:09 PM 01/11/14 07:09 PM
Joined: Jan 2003 Posts: 32,934 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,934 Grand Prairie,Texas	Yes it has to be able to kill the engine which means you have to wire the alternator cut off at main power switch in the rear. If not then the alternator will continue to feed the ignition circuit.

Re: trunk mount battery diagram [Re: stumpy] #1561746 01/11/14 07:14 PM 01/11/14 07:14 PM
Joined: Apr 2003 Posts: 989 spokane/pullman Wa R ryanf OP super stock
ryanf OP super stock R Joined: Apr 2003 Posts: 989 spokane/pullman Wa	Which is the battery disconnect switch correct?

Re: trunk mount battery diagram [Re: ryanf] #1561747 01/11/14 07:40 PM 01/11/14 07:40 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	You are making this more difficult than it needs to be. Why a CD relay on the starter line. Wrong piece and totally unnecessary. Use a Ford relay, cheap and easy. Fuses and Breakers... ????? You need to be aware of the amp load flowing through each device. Those 4 poles are not a great choice in some cases. Use the appropriate device for the task. You've seen a couple of methods to wire things up and got some confusing responses from a person on another board. That person knows what he's talking about most of the time. In this case he's way off base IMO. You've added items to them that are not really necessary. Keep it SIMPLE but safe. Just remember, there is a minimum standard and improvements on that minimum standard. ------------------------------------------- Do you want a fat starter wire running forward being hot all the time? Yes, just run that fat wire forward direct off the battery. No, place a ford solenoid in line. Want the alt line hot all the time? Wire it staright to the battery. No, place a CD relay in line. Those are the two biggest issues IMO. Pick where you want the system to be totally dead in the car when the master is turned off.

Re: trunk mount battery diagram [Re: RobX4406] #1561748 01/11/14 07:58 PM 01/11/14 07:58 PM
Joined: Apr 2003 Posts: 989 spokane/pullman Wa R ryanf OP super stock
ryanf OP super stock R Joined: Apr 2003 Posts: 989 spokane/pullman Wa	Quote: You are making this more difficult than it needs to be. Why a CD relay on the starter line. Wrong piece and totally unnecessary. Use a Ford relay, cheap and easy. Fuses and Breakers... ????? You need to be aware of the amp load flowing through each device. Those 4 poles are not a great choice in some cases. Use the appropriate device for the task. You've seen a couple of methods to wire things up and got some confusing responses from a person on another board. That person knows what he's talking about most of the time. In this case he's way off base IMO. You've added items to them that are not really necessary. Keep it SIMPLE but safe. Just remember, there is a minimum standard and improvements on that minimum standard. ------------------------------------------- Do you want a fat starter wire running forward being hot all the time? Yes, just run that fat wire forward direct off the battery. No, place a ford solenoid in line. Want the alt line hot all the time? Wire it staright to the battery. No, place a CD relay in line. Those are the two biggest issues IMO. Pick where you want the system to be totally dead in the car when the master is turned off. thanks RobX4406, yes i think this past week reading and looking at diagrams has made me more confused than when i started. So put in a ford solenoid in line for the starter and a cd relay for the alternator and call it good? im just trying to be really careful/safe as i've been working on this car for a long time and dont want something stupid to happen because i went cheap/unsafe.

Re: trunk mount battery diagram [Re: ryanf] #1561749 01/11/14 08:10 PM 01/11/14 08:10 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	Quote: Quote: Thanks for the replies, but if i want to take it to the track dont i have to be able to kill the engine with the switch? How would you wire it? The simple way is to use a simple 2 post switch at the trrunk. Run the charge wire from the alternator to the trunk (6 gauge min) and put it on battery side of the switch. No relay required. When you turn the switch off, power from both the battery and alternator is shut off completely.

Re: trunk mount battery diagram [Re: ryanf] #1561750 01/11/14 08:13 PM 01/11/14 08:13 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Paralysis by analysis. LOL I do a Ford starter relay and a CD relay in alt line. Both of those placed in close proximity to your battery. Run one wire forward off an appropriately rated cutoff switch to the mopar starter relay lug, fuse it if you like. Pretty straight forward. Just don't hook up your old alternator charge line. That will bypass/defeat the master cut off by feeding power back to the original mopar starter relay.

Re: trunk mount battery diagram [Re: RobX4406] #1561751 01/11/14 09:37 PM 01/11/14 09:37 PM
Joined: Apr 2003 Posts: 989 spokane/pullman Wa R ryanf OP super stock
ryanf OP super stock R Joined: Apr 2003 Posts: 989 spokane/pullman Wa	Quote: Paralysis by analysis. LOL I do a Ford starter relay and a CD relay in alt line. Both of those placed in close proximity to your battery. Run one wire forward off an appropriately rated cutoff switch to the mopar starter relay lug, fuse it if you like. Pretty straight forward. Just don't hook up your old alternator charge line. That will bypass/defeat the master cut off by feeding power back to the original mopar starter relay. So like this diagram (picture was not displaying, attached link) http://smg.photobucket.com/user/crackedback/media/Electrical/trunkbattwireRY.jpg.html (think this is one one i first started with) Last edited by ryanf; 01/11/14 09:39 PM.

Re: trunk mount battery diagram [Re: ryanf] #1561752 01/11/14 09:40 PM 01/11/14 09:40 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	yes. Switch the CD relay on/off with a keyed/switched lead, not straight off the downstream side of the master cut off. That way it doesn't create a constant draw.

Re: trunk mount battery diagram [Re: RobX4406] #1561753 01/12/14 07:56 PM 01/12/14 07:56 PM
Joined: Feb 2013 Posts: 401 California, USA filmsurgeon mopar
filmsurgeon mopar Joined: Feb 2013 Posts: 401 California, USA	Glad to see this topic posted. I will soon be relocating my battery to the trunk on my '70 Challenger, and have done some internet research in the recent past, but find it all a bit confusing. I am not very good when it comes to vehicle electronics/wiring. So hopefully this thread will give me some help and better understanding. I certainly don't want/need a complicated scheme; just one that is effective, simple and safe. Already planned on using "0" gauge welding cable for main positive/negative leads. Probably will be doing all the lug and terminal installations myself.

Re: trunk mount battery diagram [Re: filmsurgeon] #1561754 01/12/14 08:14 PM 01/12/14 08:14 PM
Joined: Jan 2003 Posts: 32,934 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,934 Grand Prairie,Texas	If you aren't building a race car there is no real need to move the battery to the trunk. Remember the battery off gasses acidic vapors when charging so you will be adding a corrosive gas to the trunk area.

Re: trunk mount battery diagram [Re: filmsurgeon] #1561755 01/12/14 08:39 PM 01/12/14 08:39 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Already planned on using "0" gauge welding cable for main positive/negative leads. Probably will be doing all the lug and terminal installations myself. On the welding cable lugs I would sugest cutting the cables to the length(s) you need then go back to the welding supply shop & have them crimp on the terminals. Here they'll do it for free since you're buying their cable. Or if your measurements are spot on you can do right there when you purchase the cable lengths (as they say measure twice) live every 24 hour block of time like it's your last day on earth

Re: trunk mount battery diagram [Re: filmsurgeon] #1561756 01/12/14 08:44 PM 01/12/14 08:44 PM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	Quote: Glad to see this topic posted. I will soon be relocating my battery to the trunk on my '70 Challenger, and have done some internet research in the recent past, but find it all a bit confusing. I am not very good when it comes to vehicle electronics/wiring. So hopefully this thread will give me some help and better understanding. I certainly don't want/need a complicated scheme; just one that is effective, simple and safe. Already planned on using "0" gauge welding cable for main positive/negative leads. Probably will be doing all the lug and terminal installations myself. If you use welding cable get the EPDM insulation. That's a much better choice for sizing over the normal 2 gauge stuff most kits come with.

Re: trunk mount battery diagram [Re: RobX4406] #1561757 01/13/14 12:09 AM 01/13/14 12:09 AM
Joined: May 2003 Posts: 1,751 Graham, WA P Polarapete top fuel
Polarapete top fuel P Joined: May 2003 Posts: 1,751 Graham, WA	At NAPA in the Belden line are cable ends that are compression type, no crimping required. I believe they are intended for commercial trucks using heavy cables. 1986 Dodge Ramcharger 440 2wd, Bracket Racer Under Construction 1998 Ram 2500 QuadCab, new daily driver. 2008 Honda Element 2014 Carry-On 7x14 Cargo Trailer

Re: trunk mount battery diagram [Re: Polarapete] #1561758 01/14/14 04:26 AM 01/14/14 04:26 AM
Joined: Oct 2008 Posts: 506 Utah, USA 1 1964superstock mopar
1964superstock mopar 1 Joined: Oct 2008 Posts: 506 Utah, USA	Forgive my ignorance, but what is a "CD relay in line?" Could someone post up some photos and part numbers please? I'm in the middle of wiring my car using the MAD electrical diagram for battery in the trunk with use of the Ford relay. What changes need to be made if using the Mad Electrical trunk wiring diagram with use of the Ford Relay, to make sure the alternator can be shut off at the main battery positive kill switch?

Re: trunk mount battery diagram [Re: 1964superstock] #1561759 01/14/14 04:40 AM 01/14/14 04:40 AM
Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central RobX4406 I Live Here
RobX4406 I Live Here Joined: Apr 2005 Posts: 12,271 Overpriced Housing Central	CD relay is a continuous duty relay. S605 relay works. Cole Hersee has spst CD relay in varying ratings. Make sure it's sized properly. http://www.colehersee.com/home/grid/cat/169/ See the diagram linked above, not the first post, down a few. On a street car, instead of triggering the CD relay using the cut off switch downstream side, use a keyed source. That way the CD relay only active when the car is running or key on.

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