Re: Wiring directly to the battery, how do you do it?
[Re: wesgtx440]
#1773971
03/07/15 04:47 AM
03/07/15 04:47 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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If these (msd/efi) need to be hot all the time & you wanted to keep the ammeter honest, for the aesthetics you could connect the neg leads to the end of the batt large neg cable that's bolted to the block and connect the pos leads to the alt "batt" stud. That'd keep em off of the battery
live every 24 hour block of time like it's your last day on earth
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Re: Wiring directly to the battery, how do you do it?
[Re: 451Mopar]
#1773973
03/07/15 01:12 PM
03/07/15 01:12 PM
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Joined: Oct 2011
Posts: 290 Dayton, WA
wesgtx440
OP
enthusiast
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OP
enthusiast
Joined: Oct 2011
Posts: 290
Dayton, WA
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Quote:
The closer to the battery, the better because the battery helps filter electrical noise.
Thanks for the replies everyone. The main reason they list directly to the battery in the instructions is for the electrical noise. This might be one of those "cant have your cake and eat it to" issues, I will just do it the way they say to avoid problems.
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Re: Wiring directly to the battery, how do you do it?
[Re: wesgtx440]
#1773974
03/07/15 07:24 PM
03/07/15 07:24 PM
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Joined: Jun 2008
Posts: 1,822 Colorado
denfireguy
top fuel
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top fuel
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Posts: 1,822
Colorado
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Wiring to the starter relay is as close as you want to go. Wiring to the battery cable gets you lots of very nice green terminals on your wiring as it ages. As mentioned before, wiring to the battery makes for a very clean source as the battery acts like a gigundous electrolytic capacitor filtering noise on the electrical system. That is why if you start hearing alternator wine in your stereo, it is time to get a new battery or at least make sure the connections to the battery are good.
2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado
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Re: Wiring directly to the battery, how do you do it?
[Re: 451Mopar]
#1773975
03/07/15 07:56 PM
03/07/15 07:56 PM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Quote:
The closer to the battery, the better because the battery helps filter electrical noise.
Horrible misinformation. The electrical noise would be no different anywhere on the charging circuit. The only thing that would differ would be the voltage itself as there will be small drops across various connections (i.e. bulkhead). The "shakiness" of the voltage will be no different as it's all the same circuit.
The only thing you gain from wiring on the battery (or starter relay) is pulling additional current through the dash harness (unless you have done a bypass), making the car that much more unsafe not mention making the ammeter totally unreliable.
The "noise" from radio is not necessarily from the alternator but from the ignition circuit, not the alternator. This is EMF and if present on one side of the charging circuit, will also be present at the other. If you have noise now, wiring from the battery probably won't help.
I pull my two electric fan relay loads from the alternator stud. No noise on my radio and my ammeter is dead accurate.
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Re: Wiring directly to the battery, how do you do it?
[Re: AARCONV]
#1773977
03/07/15 11:51 PM
03/07/15 11:51 PM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
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North Carolina
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Quote:
so you tap power right from the alt stud for the fans?..I wonder if that would be a good thing to wire up my fuel pump to instead of to the battery terminal..I guess it would lesson the draw thru the bulkhead connections...
Yes. Tap the power here and no extra current through the dash harness while the car is running (alternator charging).
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Re: Wiring directly to the battery, how do you do it?
[Re: 451Mopar]
#1773979
03/08/15 12:09 AM
03/08/15 12:09 AM
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Joined: Mar 2005
Posts: 1,550 Michigan
Kiddart
pro stock
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pro stock
Joined: Mar 2005
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Michigan
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Not to Hi Jack but I feel this questions is relevant, if the instructions say to go directly to battery what do you do if you run a cut off/ electrical kill switch?? would you go to the out side of the switch??
I have read that ant efi system doesn't like noise
Thank you Kiddart
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Re: Wiring directly to the battery, how do you do it?
[Re: 451Mopar]
#1773980
03/08/15 12:17 AM
03/08/15 12:17 AM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
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Quote:
Not misinformation. All wires have some resistance and inductance. Just because they are the same "circuit" does not mean the same location. That same common circuit could be broken down showing small resistances due to wire length (and even connections) between each part of the circuit. Having the connections closer to the battery, and on a different connection than the starter or other high current loads will also help prevent dips in the voltage when a high current load turns on. E=I*R
The inductance or capacitance of wire in a DC circuit is nill. When you get into the Ghz, that's a different story.
I agree that being on one side of the circuit vs another can result in higher or lower voltage which is due to resistance of the wire + connections in the bulkhead.
Also when a car is running, the alternator will be the source of the current, not the battery so your reasoning is backwards.
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Re: Wiring directly to the battery, how do you do it?
[Re: NITROUSN]
#1773982
03/08/15 12:55 AM
03/08/15 12:55 AM
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Joined: Jul 2007
Posts: 1,526 North Carolina
cjskotni
pro stock
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pro stock
Joined: Jul 2007
Posts: 1,526
North Carolina
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Quote:
Quote:
I pull my two electric fan relay loads from the alternator stud.
That is not a good idea. If it works for you fine. It is not right.
Oh really? Please explain...
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Re: Wiring directly to the battery, how do you do it?
[Re: cjskotni]
#1773984
03/08/15 01:06 AM
03/08/15 01:06 AM
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Joined: Feb 2015
Posts: 2,075 CA
crackedback
top fuel
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top fuel
Joined: Feb 2015
Posts: 2,075
CA
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Quote:
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I pull my two electric fan relay loads from the alternator stud.
That is not a good idea. If it works for you fine. It is not right.
Oh really? Please explain...
Same as pulling headlight power from the alternator charge stud. It works absolutely fine and keeps the amp load off the bulkhead. The charge stud is a better solution unless you've done the wire around using a significantly better sized wire.
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Re: Wiring directly to the battery, how do you do it?
[Re: cjskotni]
#1773986
03/08/15 01:41 AM
03/08/15 01:41 AM
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Joined: Jan 2003
Posts: 18,419 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
I Live Here
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I Live Here
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UPPER MICHIGAN, MARQUETTE COUN...
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Quote:
Quote:
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I pull my two electric fan relay loads from the alternator stud.
That is not a good idea. If it works for you fine. It is not right.
Oh really? Please explain...
Like I said if you are happy than fine. Not to make a debate on your logic but to put it in simple logic when have you seen a production auto have accessories tapped of the alternator stud.
The original poster of this thread was concerned as to proper wiring of his MSD. The correct way is to have the power and ground close or directly from the battery. RFI interference is not always something related to radio noise. RFI can play into today's digital and multiplexing world without radio issues.
I would wire my loads directly to the battery and let my charging alternator and wiring maintain the battery.
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Re: Wiring directly to the battery, how do you do it?
[Re: 451Mopar]
#1773988
03/08/15 04:21 AM
03/08/15 04:21 AM
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Joined: Aug 2003
Posts: 43,176 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,176
Bend,OR USA
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Does anyone who has put comments on this post understand current flow in D.C.(Direct Current) circuits? If I understand(edited) the operation of the electrcial operated injectors on EFI systems they pulse the negative(battery) side of the injector with -5.5 volts, correct , ? If so then doesn't all the elecrtons need to return to thier source to complete the circuit?(make the injectors pulse) That being said you might want to follow the instructions from the manufacture to the T
Last edited by Cab_Burge; 03/08/15 03:03 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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