LS1 swap charging issues
LS1 swap charging issues Having charging issues with my swap, can anyone tell me what the generator turn on signal is suppose to be for a 2001 f-body pcm, currently have 10 volts, thank you
Voltage gauge shows 12.5 volts, voltage on alternator exciter wire shows ~ 10 volts. I thought I read somewhere exciter wire is suppose to be 5 volt signal.....thanx for all the replies
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On a side note, the harness was a 98 f-body i converted to 99+ specs with a 99+ pcm however the alternator is still 98... would the alternator being a 98 make any difference ?
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Staging Lane
Joined: Dec 2005
Posts: 86
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From: Portland, Oregon
I was just fighting a dead alternator - exciter wire was ~1 volt less than battery voltage.
You can test the alternator by hard wiring the exciter wire to 12volt - you aren't going to hurt anything running it for a few minutes that way. You can also wire it to a battery light in the car if you wanted to do it that way.
You can test the alternator by hard wiring the exciter wire to 12volt - you aren't going to hurt anything running it for a few minutes that way. You can also wire it to a battery light in the car if you wanted to do it that way.
I have tested two f-body setups and approx 10 volts is what the generator turn on wire is supposed to put out. Sounds like you're getting the right signal to the alternator.
sweet ! thanx for the info....After further evaluation, it seems I have everything wired correctly and all the wiring is good. I wired up an idiot light under the hood to simulate a dash light and the alternator wont charge that way either. I have a good alternator coming from a fellow Tech member, hopefully my troubles will be over soon. Thanx everybody
It would have, kinda. I was removing the alternator in preparation for the new one when it got here and noticed there was no nut on the battery charging wire stud. Apparently some dumbass had forgotten to put it on and the wire was just bouncing around on the stud causing my issues. So there you go, no matter how good you remember installing parts always double check everything when troubleshooting a problem. I knew that but thought I had everyhting covered. Thanx to everyone who helped me out.
