Battery Disconnect Switch .... Help!
#1133836
12/14/11 01:56 AM
12/14/11 01:56 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
master
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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Moving battery to the trunk. I'm not very versed in electrical. I see disconnect switches anywhere from 20 amp to 250 amp. What do I need and why? Street strip car, stock 1967 electrical system.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Battery Disconnect Switch .... Help!
[Re: StealthWedge67]
#1133837
12/14/11 02:24 AM
12/14/11 02:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Moving battery to the trunk. I'm not very versed in electrical. I see disconnect switches anywhere from 20 amp to 250 amp. What do I need and why? Street strip car, stock 1967 electrical system.
250 amp... the starter itself will draw near 100
thats short time but you have alot of other stuff
drawing all the time... also see if its constant duty 250
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Re: Battery Disconnect Switch .... Help!
[Re: StealthWedge67]
#1133839
12/14/11 12:08 PM
12/14/11 12:08 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
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Renton Washington
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Bigger is better. Mine was meant for a industrial application with multiple batteries, I don't know what its rated at but its a lot.
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: Battery Disconnect Switch .... Help!
[Re: Triple Threat]
#1133840
12/14/11 12:39 PM
12/14/11 12:39 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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okay, I placed my order with Summit. I went with 1-guage cable, and the summit 250-amp waterproof switch.
My MSD is fed directly off the starter relay. If I'm thinking this through correctly, when you hit the disconnect switch at the back of the car with my ignition wired like this, it should shut the car down, correct?
Last edited by GEnsrud; 12/14/11 02:50 PM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Battery Disconnect Switch .... Help!
[Re: StealthWedge67]
#1133842
12/14/11 05:25 PM
12/14/11 05:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
okay, I placed my order with Summit. I went with 1-guage cable, and the summit 250-amp waterproof switch.
My MSD is fed directly off the starter relay. If I'm thinking this through correctly, when you hit the disconnect switch at the back of the car with my ignition wired like this, it should shut the car down, correct?
UNLESS you have the alt out put wire is attached to
that same lug on the relay, then the ignition will
still be hot... if your alt wire goes to the battery
side of the master it will kill the engine
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Re: Battery Disconnect Switch .... Help!
[Re: MR_P_BODY]
#1133843
12/17/11 10:35 PM
12/17/11 10:35 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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Puyallup, WA
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I haven't made any of the changes yet, but today I yanked the positive cable while the car was running, and it kept running. Sooooo, how do I rewire the alternator, Mike?
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Battery Disconnect Switch .... Help!
[Re: StealthWedge67]
#1133844
12/18/11 12:24 AM
12/18/11 12:24 AM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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The small red wire from the MSD needs to be downstream from the cut off switch. That is the trigger or on/off wire for the box. The big red wire that goes to the battery can be on either side of the cut off switch, preferably directly on the battery post. I prefer a trunk mounted ford style solenoid and not running starter draw through the cut off switch. Here are some diagrams.   
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Re: Battery Disconnect Switch .... Help!
[Re: RobX4406]
#1133845
12/18/11 12:42 AM
12/18/11 12:42 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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I've got it now. I'm just going to bring the alternator wire to the battery side of the disconnect switch (2nd diagram above).
Thanks-
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: Battery Disconnect Switch .... Help!
[Re: StealthWedge67]
#1133846
12/18/11 12:57 AM
12/18/11 12:57 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I've got it now. I'm just going to bring the alternator wire to the battery side of the disconnect switch (2nd diagram above).
Thanks-
You'll be set then
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