HELP... need diode for alternator after gauge swap!?!?
02-19-2001, 07:49 PM
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Car: 2002 SOM z28
Engine: LS1
Transmission: T-56
HELP... need diode for alternator after gauge swap!?!?
I replaced the gauges in my dash a few weeks ago. I thought I replaced the choke light with a bulb too... but it doesn't light up when I first start the car. I thought nothing of it until last weekend.
I figured my alt died and it drained my battery. Evidently that may not be the case. Someone told me (and it makes sense) that the alt doesn't "know" the car is on.
All I can say for sure is that my choke works. Also, the new alt I got last week is NOT working (volts with car on is 11.5V...12.5 with car off).
He also said something about using a diode to the alt from a switched source. Can I do something to get it running correctly?
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
I figured my alt died and it drained my battery. Evidently that may not be the case. Someone told me (and it makes sense) that the alt doesn't "know" the car is on.
All I can say for sure is that my choke works. Also, the new alt I got last week is NOT working (volts with car on is 11.5V...12.5 with car off).
He also said something about using a diode to the alt from a switched source. Can I do something to get it running correctly?
------------------
1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...
-=ICON Motorsports=-
02-19-2001, 09:33 PM
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one of the factory wires that go to the small plug in the side of the alternator has a diode in it. Sometimes that diode burns out and the alternator no longer charges.
02-20-2001, 07:31 AM
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Car: 2002 SOM z28
Engine: LS1
Transmission: T-56
That's what I am sort of thinking too. RB suggested the correct diode... where do I locate the old one?
IIRC- The plug has a black and a red wire. The red wire only goes from the plug to the terminal that has a bolt and is covered by a red plastic cap. Another wire goes from that to the pos terminal on the battery.
The black wire comes from the computer harness somewhere, should I install the diode to a switched source there? I don't run the computer anymore...
IIRC- The plug has a black and a red wire. The red wire only goes from the plug to the terminal that has a bolt and is covered by a red plastic cap. Another wire goes from that to the pos terminal on the battery.
The black wire comes from the computer harness somewhere, should I install the diode to a switched source there? I don't run the computer anymore...
02-20-2001, 05:20 PM
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Car: '92 Z28; Dk Teal; Her Pkg
Engine: 305
Transmission: Richmond 6 Spd
Axle/Gears: Moser 9", Detroit Locker, 3.70
ODB, you may be confusing a diode with the nichrome resistance wire that is used in some alternator configurations to power the field winding. The resistance wire isolates the alternator from the other accessories powered from the same source.
Tim
Tim
02-20-2001, 08:41 PM
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Car: 2002 SOM z28
Engine: LS1
Transmission: T-56
<font face="Verdana, Arial" size="2">Originally posted by TunedPort350:
The diode is located inside the alternator, it is located between the rectifier bridge and the voltage regulator. I can send you a pic if you want.</font>
The diode is located inside the alternator, it is located between the rectifier bridge and the voltage regulator. I can send you a pic if you want.</font>
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