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Gm Delco alternator question
I have an alternator that has been checked out at the local Autozone,
it passed...it's good. But I installed it in my car, A 1987 Firebird formula, and it doesn't charge. I disconnected the battery output and used a test light on the output, and nothing. There are 3 wires plugging into the alternator, I know the first wire is power, the second goes to an idiot light, where does the third wire go?? |
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#2
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Gm Delco alternator question
Right around that year, GM decided for some strange reason to flip the
alternators plug's pins. One is the excite wire that 'turns on' the alternator. I would swap pin one and two in the white plug to see if that turns it on. I have seen this happen a few times. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) CGBear wrote: > > I have an alternator that has been checked out at the local Autozone, > it passed...it's good. > But I installed it in my car, A 1987 Firebird formula, and it doesn't > charge. I disconnected the battery output and used a test light on the > output, and nothing. There are 3 wires plugging into the alternator, I > know the first wire is power, the second goes to an idiot light, where > does the third wire go?? |
#3
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Gm Delco alternator question
CGBear wrote: > I have an alternator that has been checked out at the local Autozone, > it passed...it's good. > But I installed it in my car, A 1987 Firebird formula, and it doesn't > charge. I disconnected the battery output and used a test light on the > output, and nothing. There are 3 wires plugging into the alternator, I > know the first wire is power, the second goes to an idiot light, where > does the third wire go?? I'm assuming that this is a 10SI, the third wire parallels the battery wire, it is there for remote voltage sensing. it should have +12V on it even when disconnected from the alt. nate |
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Gm Delco alternator question
CGBear wrote: > I have an alternator that has been checked out at the local Autozone, > it passed...it's good. > But I installed it in my car, A 1987 Firebird formula, and it doesn't > charge. I disconnected the battery output and used a test light on the > output, and nothing. There are 3 wires plugging into the alternator, I > know the first wire is power, the second goes to an idiot light, where > does the third wire go?? I'm assuming that this is a 10SI, the third wire parallels the battery wire, it is there for remote voltage sensing. it should have +12V on it even when disconnected from the alt. nate |
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Gm Delco alternator question
Should the alternator still charge even if the wires aren't hooked to
the regulator? Or do you have to have one wire with power going to the regulator? |
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Gm Delco alternator question
You need all 3 wires hooked up. That is the reason they put 3 wires on
it. One feeds the battery power, one senses voltage level and one 'excites' or turns on the alternator's magnetic field. Folks can make pretty good trail arc welders by bypassing the regulator on those alternators..... I sure wouldn't want that feeding my battery or electronics. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) CGBear wrote: > > Should the alternator still charge even if the wires aren't hooked to > the regulator? Or do you have to have one wire with power going to the > regulator? |
#7
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Gm Delco alternator question
I got a wiring schematic from a buddy that has the Alldata programs.
It rained a bit today so I'll hopefully get it figured out tomorow morning. Thank you for your input. |
#8
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Gm Delco alternator question
Just remember they switched pin one and pin two on the smaller plastic
plug in the mid 80's. Hooking it wrong won't hurt anything, it just won't charge. You can even see the pin numbers stamped on the case and on the plug. Mike CGBear wrote: > > I got a wiring schematic from a buddy that has the Alldata programs. > It rained a bit today so I'll hopefully get it figured out tomorow > morning. Thank you for your input. |
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