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ON OFF Battery Switch.. How to kill alternator?
#333498
05/30/09 05:14 PM
05/30/09 05:14 PM
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Joined: Jan 2003
Posts: 4,288
Danville, NH
Mopar_Mike
OP
master
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OP
master
Joined: Jan 2003
Posts: 4,288
Danville, NH
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For my track car I have an ON OFF switch in the rear bumper for the trunk batteries. I have + to one side of the switch and the other side to the starter and feed for the car. If I turn the switch to off the car still runs, because it is running off the alternator. If I unplug the green wire terminal on the alternator the car will start and run. Because it is running off the batteries. Now if I turn the switch to OFF the car dies. Because I killed the batteries. But how do I kill the batteries and the alternator with that ON OFF switch?
RS23L7 4-Speed
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: 440Jim]
#333502
05/30/09 06:50 PM
05/30/09 06:50 PM
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Joined: Jan 2003
Posts: 1,367
Jersey shore
Gary67
super street
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super street
Joined: Jan 2003
Posts: 1,367
Jersey shore
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Quote:
The other alternative is to run the big power lead from the alternator all the way to the battery side of the kill switch. But use a fusible link since that wire will be hot at all times, even with the kill switch off.
I basicaly did this with my 66 but, I used a Ford relay for the starter lead so the large cable is only hot when cranking. I ran 6 gauge from the alt back to a continuous duty solenoid rated twice the amp output of my alt switched on and off by the master. The power tap wire for my fuel pump fan, MSD,etc, is #8, the whole car is shut down with the #8, kills the car dead...When the master is off the car is dead from the battery box forward... Just another way to kill the car, but this way it eliminates the alt wire staying hot when the switch is off...solenoids cost me under $40.00....
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: MoparforLife]
#333507
05/30/09 11:01 PM
05/30/09 11:01 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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I agree. no need for relay. Just disconnect your old alt main Alt B + wire, and run a new heavy wire from the alt post to the battery side of the kill switch. It works every time, is cheap, and easy. The rules state that all electrical function must cease when the wire is tripped. It doesn't say that there can't be any live wires in the car. The other plus to this, is that the alt gauge is now bypassed, so you don't have to worry about that thing going bad with a newer/bigger alternator either. 
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: RobX4406]
#333509
05/31/09 01:47 AM
05/31/09 01:47 AM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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In all my Cars, I run an Ign + 12V to a Holley Fuel systen safety switch on the back of the motor and then all the way back to a micro switch piggybacked on the main disconnect and then split to the fuel pump relay and then all the way back up to the front of the car and that feeds the MSD control "on" function(small red wire). You also need a 12 volt Positive bypass wired through a "deadman switch" to get the car running. It is kind of convinient because you hit the deadman switch and the fuel pump runs and the ignition is hot pump the gas pedal a couple times and you hit the key and start the car. As soon as the oil light goes out you can release the switch and you are good to go.
So, if the car loses oil pressure it will kill the ignition and the fuel pump, or if you open the main disconnect the ignition and the fuel pump will turn off. All this is wired with 18Ga wire as it is only the control circut wire.
That way there are no other relays and there is no 8Ga wire running the lenght of the car to the alternator that is still hot after the main disconnect is opened.
Last edited by dragrcr97; 05/31/09 01:48 AM.
SRT DEMON ONE SEAT
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: MoparforLife]
#333512
05/31/09 07:51 AM
05/31/09 07:51 AM
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Joined: Jan 2003
Posts: 1,367
Jersey shore
Gary67
super street
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super street
Joined: Jan 2003
Posts: 1,367
Jersey shore
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Quote:
It is the battery wire on the alternator that goes to the battery side of the switch. (the large one with the nut on it)
The reason that the engine will not kill with the kill switch is because with the car running it still has the alternator putting out enough to let the engine run. If the switch is turned to off with the engine not running it will not start or turn over.
everybody that needs that extra relay or solenoid had best install one on all their drivers as that wire is hot at all times there too.
Big difference, in my driver that wire is in the engine compartment and doesn't have an additional 15' tacked on to it running through or under the car..
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: moparniac]
#333514
05/31/09 11:23 AM
05/31/09 11:23 AM
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Joined: Apr 2007
Posts: 807
Toronto, Canada
dirtybee
super stock
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super stock
Joined: Apr 2007
Posts: 807
Toronto, Canada
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Quote:
all i did and works fine....
doesn't the factory wire also power some stuff inside the car? i did the ammeter bypass as per the madelectric site, then moved my batt to the trunk and have yet to install the cutoff switch that i bought. i have been debating how i want to do it and if simply running the alt wire to the switch will do it without effecting anything else i will do that. 
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Re: ON OFF Battery Switch.. How to kill alternator?
[Re: dave571]
#333515
05/31/09 01:27 PM
05/31/09 01:27 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
... run a new heavy wire from the alt post to the battery side of the kill switch.
The rules state that all electrical ....must cease when the wire is tripped. It doesn't say that there can't be any live wires in the car.
In my opinion, this is very dangerous thinking. The entire reason for the rules is to provide the safest possible situation, to avoid sparking, heat, and other fire causing sources along with leaking fuel in a crash. A large, hot charging wire can generate a hell of a lot of sparks and heat. Even if fused or otherwise protected, this can be a bad deal
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Re: ON OFF Battery Switch.. How to kill alternator?
#333517
05/31/09 02:22 PM
05/31/09 02:22 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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Quote:
Quote:
... run a new heavy wire from the alt post to the battery side of the kill switch.
The rules state that all electrical ....must cease when the wire is tripped. It doesn't say that there can't be any live wires in the car.
In my opinion, this is very dangerous thinking. The entire reason for the rules is to provide the safest possible situation, to avoid sparking, heat, and other fire causing sources along with leaking fuel in a crash. A large, hot charging wire can generate a hell of a lot of sparks and heat. Even if fused or otherwise protected, this can be a bad deal
It's how every factory car on the road is wired.
That said, how often is the cause of death in a wreck, a fire caused by a pinched electrical wire?
The point of the rule is to stop you electrical components from running. There is no way to forsee evey possible situation in a wreck.
IMHO if the cutoff switch rule had much merrit, it would apply to ALL the cars, not just the ones who have relocated the battery.
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Keep up the Good work
