[FC] Gen/Fan Light wreaking havoc

[Joel McGregor]

The way the light works from what I understand is - it has 12v on one side
and the other goes to the trigger wire on the alternator.  When the
alternator isn't energized and charging the trigger wire acts as a ground
and the bulb lights.  When the alternator is charging you have voltage on
the trigger wire so the bulb has the same voltage on both sides which makes
0v difference and the light is off.
1)  Engine off and key on you should have battery voltage on one side of the
bulb and ground on the other wire going back to the alternator.  
2)  Engine running you should read charging voltage on BOTH wires going to
the bulb.
In situation 1 if you have no voltage at the bulb you need to check the
wiring under the dash that powers the bulb - the switched hot from the
ignition switch.
If you have power but no ground you need to check the wire from the bulb to
the alternator.
This is all assuming that it is an alternator and it is wired to trigger
from the bulb instead of the bulb just working for the temp light.  I'm also
assuming that it is a newer internally regulated alternator.  Probably too
many assumptions....     Joel

-----Original Message-----
From: corvanatics-bounces at corvair.org
[mailto:corvanatics-bounces at corvair.org] On Behalf Of BobHelt at aol.com
Sent: Sunday, August 06, 2006 11:48 AM
To: jforgey4 at yahoo.com; corvanatics at corvair.org
Subject: Re: [FC] Gen/Fan Light wreaking havoc

 
In a message dated 8/6/2006 9:34:11 AM US Mountain Standard Time,  
jforgey4 at yahoo.com writes:

Cleaned  the connections on the battery - and the
wiring harness in the engine  compartment ( with
product reccomended by NAPA ) checked the voltage  -
battery is getting just above 12 volts with no load -
with load test  it drops to just around 11.




Alternator isn't charging. Charging voltage should be about 14 volts. could

also have a bad batterty. Voltage of 11 volts indicates a bad or discharged

battery.
Regards,
Bob Helt
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