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 Post subject: Alternator wiring
PostPosted: Thu Jan 29, 2009 10:39 am 
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Addicted to LUV

Joined: Mon Aug 28, 2006 11:54 pm
Posts: 6584
Location: Pelahatchie, MS
I am trying to install an alternator in my truck to keep the voltage drop to a minimum when I am at the track and all the bells and whistles go off. I have a couple of questions regarding this as I have not had a stock one in a good while...

I installed a 1 wire mini, but it will not allow the truck to shut off due to it backfeeding. I am installing an ammeter and am intending to find an existing wire for the key circuit, (it starts and shuts off now with the key), but I would like to use the wires that were actually used for this, if possible.

My truck does not have the famous relays under the cover on the passenger side of the engine compartment. I belive the truck is a 78 model.

1. Will the stock alt. wiring work without those relays?

2. What does the stock wiring plug to the alt. look like and what color are the wires?

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 Post subject: Re: Alternator wiring
PostPosted: Thu Jan 29, 2009 10:41 am 
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Location: Camarillo, CA
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 Post subject: Re: Alternator wiring
PostPosted: Sun Feb 08, 2009 1:38 pm 
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Joined: Sun Dec 21, 2008 12:11 am
Posts: 335
The alternator wiring on a stock LUV would drive an electrical engineer crazy! However here goes, the regulator has two relays inside it, one to control the alternator output, the second one is used to send a signal to the relay box over on the right fender and this relay turns on your fuel pump.
If you are using a one wire alternator, which is what I do on all of my V8 conversions, I toss the alternator regulator and trim off the wires.Makes things a lot more simple that way, I run the fuel pump wire to an electrical switch, either the keyed wires, or much safer install a oil pressure relay that turns on the fuel pump when there is enough oil pressure. This prevents the pump from running when the engine is off or if you are involved in an accident, the pump shuts off.

Just run the large "one" wire from the new alternator directly to the starter large terminal, the one from the battery, and you won't have any more problems. But you will have to use a volt meter to check if the battery is charging.
Inside the wiring loom that runs down the inside of the left fender and goes under the radiator over to the right side? Inside this loom are two very large black wires, about 12 guage, these connect together inside this loom up by the radiator, so you can tap into either of these for a large current draw item or to charge the battery. Hope this helps,

dusty


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