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GM altenator wiring?

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hotrod56cars

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« on: December 05, 2006, 09:10:06 PM »
So I've re-wired more than 10 cars/trucks so far with most of them being pre-1949 hot rods. I've also wired up a few boats and trailers in my day. I like using GM altenators with built in regulators for their wiring simplicity, their reliability, and I can go down to the local Pick Your Part and buy one for $12.50 with a 30 day warranty. The problem is that the only way that I know how to wire them up is to use a light bulb, er idiot light. Does anyone here know how to wire one of these suckers up without an idiot light?
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MikeG

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« Reply #1 on: December 06, 2006, 08:05:38 AM »
if im not mistaken, correct me if wrong but the main larger wire on your typical 3 wire alternator is the charge wire that goes to the battery or battery isolator (if more then one battery is used) then on the 2 pin connector there is a brown wire i believe and a red wire, the red wire is the ignition wire it tells the alternator how much power the battery has basically thats basically the hot ignition wire (in a sence the power on to the alternator) then the other brown wire is the idot light to tell that the alternator is working or not.  youc an simply hook up the large wire to the battery then the others to the ignition, then with a volt meter when running check that you have around 13-15 volts runnng then 12volts with the engine off (check at charge wire of alternator) this will show a correct installation (i believe this will only work pre 1985) after that they have different pickups that i believe work magnetially and even though they sell wire adapters for them there not as reliable.

MikeG

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« Reply #2 on: December 06, 2006, 08:07:56 AM »
if you want me to check futher i wired up the 110 amp (modified) gm alternator in my motorhome manually and ill confirm where i routed the wires but i believe that to be correct. it works perfectly and reliably

hotrod56cars

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« Reply #3 on: December 06, 2006, 08:39:37 AM »
You have the color codes correct, but I've tried using them without an idiot light and it didn't work until I added an idiot light to the circuit.
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NO REGRET$ ... Arguing on the internet is like competing in the Special Olympics / no matter how good you do you're still retarded!!!!!

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MikeG

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« Reply #4 on: December 07, 2006, 09:25:40 AM »
then i believe you have ran into the newer style alternator (like newer then 85 model) the pickup for chargeing is somehow ran off that light, the newer model wont always function without that setup i had one orig in my rv cauce they put out more amps but that would be the prob i had with it


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