I wire alternator to kill switch in rear
#2310519
05/24/17 06:49 PM
05/24/17 06:49 PM
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Joined: Jan 2003
Posts: 11,728 Portage,michigan
B3422W5
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If I buy a 1 wire alternator, use 2 guage wire, and run that 2 guage from the positive on the alternator to the battery side of the kill switch in the rear of the car..... should I be good to go?
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2310585
05/24/17 09:19 PM
05/24/17 09:19 PM
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Joined: Dec 2005
Posts: 11,705 Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
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2 gauge is awfully heavy. I use 8, maybe 6 on a real long run or a car with a high electrical load. You're not charging a dead battery - or shouldn't be - just maintaining voltage with the engine running. Heck, I use 2 for the main cable. Don't need an extra 20lbs in the car.
If the results don't match the theory, change the theory.
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Re: I wire alternator to kill switch in rear
[Re: cudadon]
#2310592
05/24/17 09:34 PM
05/24/17 09:34 PM
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Joined: Nov 2003
Posts: 10,384 Upstate NY
Bigcube
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Jim the alt wire is only hot when the engine is running (switch is on). The ign./ key goes to the small term. correct? Where do you mount the relay? that is a good idea. Don Not in the case of a 1 wire GM alternator. It will be hot all the time when connected to the battery side of the switch. If you connect the wire from the alternator to the car side of the switch, the car will keep running on alternator even when the kill switch is off. The wiring diagram kill's power power to the alternator when the switch is off.
Jim
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Re: I wire alternator to kill switch in rear
[Re: cudadon]
#2310606
05/24/17 09:50 PM
05/24/17 09:50 PM
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B3422W5
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Jim the alt wire is only hot when the engine is running (switch is on). The ign./ key goes to the small term. correct? Where do you mount the relay? that is a good idea. Don So if I do it like in my original post, when I flip the switch will it kill the car running or not? Kinda confused I guess.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2310611
05/24/17 09:54 PM
05/24/17 09:54 PM
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Joined: Nov 2003
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Bigcube
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Yes, the car will be killed when you flip the switch but the wire will be hot all the time. The relay prevents that.
Jim
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Re: I wire alternator to kill switch in rear
[Re: Bigcube]
#2310619
05/24/17 10:04 PM
05/24/17 10:04 PM
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Joined: Jan 2003
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B3422W5
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Yes, the car will be killed when you flip the switch but the wire will be hot all the time. The relay prevents that. Guess I dont see the issue with it being " hot" when the car is turned off. The battery is " hot" too when the car is turned off. That's like saying a light switch is hot when it's off, because power is still at the switch. ??
Last edited by B3422W5; 05/24/17 10:05 PM.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2310625
05/24/17 10:12 PM
05/24/17 10:12 PM
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Joined: Nov 2003
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Bigcube
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Yes, the car will be killed when you flip the switch but the wire will be hot all the time. The relay prevents that. Guess I dont see the issue with itt being " hot" when the car is turned off. The battery is " hot" too when the car is turned off. ?? Not a huge deal, until you think everything is off and put a wrench on the alternator to remove it and create a bunch of sparks when it hit's the frame. I've done that a few times pulling the motor prior to fixing it with the relay. I also think about the case of a wreck, and something pinches the wire from to the alternator to the battery. I want everything off from the batteries forward when the switch if off.
Jim
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2316947
06/06/17 12:26 AM
06/06/17 12:26 AM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
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master
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Tulsa OK
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My continuous solenoid is wired through my 4 pole cutoff switch and my ignition switch. That way I can leave the main power on and not worry about the battery going dead.
I learned that the Cole Hearsey(sp?) solenoid is much better than the ford style solenoid I was using. The Cole Hersey one has lasted 4 years now, I used to keep a wrench in the car so I could lean under the dash and whack the old ford style so it would start working, one whack was good for 24 hours.
68 Barracuda Formula S 340
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2316954
06/06/17 12:33 AM
06/06/17 12:33 AM
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Posts: 1,942 Metro Detroit
OUTLAWD
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I have the Cole Hearsey one as well, just wired to the kill switch. Good call on wiring it to the IGN!
I didn't like the idea of having a hot wire under the hood when everything is "off", and I can't find my rulebook, but isn't it supposed to kill all the power?
Faster, Faster until the thrill of speed overcomes the fear of death...
71 Swinger - slowly collecting dust/parts 66 Belv. II - just a streetcar 88 Mustang - turbo LS beater
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Re: I wire alternator to kill switch in rear
[Re: OUTLAWD]
#2317069
06/06/17 11:01 AM
06/06/17 11:01 AM
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Joined: Jan 2003
Posts: 8,035 Tulsa OK
Bad340fish
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master
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Tulsa OK
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I have the Cole Hearsey one as well, just wired to the kill switch. Good call on wiring it to the IGN!
I didn't like the idea of having a hot wire under the hood when everything is "off", and I can't find my rulebook, but isn't it supposed to kill all the power? Yeah I wired it to the ignition after I got in late one night and forgot to turn the kill switch off, then didn't touch the car for two weeks. I believe the cutoff is supposed to kill the car and all power.
68 Barracuda Formula S 340
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Re: I wire alternator to kill switch in rear
[Re: B3422W5]
#2317071
06/06/17 11:25 AM
06/06/17 11:25 AM
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Joined: Dec 2014
Posts: 304 Florida
Mark Whitener
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enthusiast
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Get one of these, a Cole Hersee 75912BX 125 amp continuous, 750 momentary, and a double pole double terminal to have one side to cut off the battery, the other to cut the alternator.
Last edited by Mark Whitener; 06/06/17 11:26 AM.
Mark Whitener [url=www.racingfuelsystems.com[/url]
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