Unwanted Dash Battery light
Thread Starter
2nd Gear
Joined: Aug 2018
Posts: 2
Likes: 0
Unwanted Dash Battery light
On my 1980 L82 the dash voltmeter shows the alternator is charging but the battery light stays 0n. It dims with increased engine RPM but never goes out. Any ideas on a fix would be most appreciated.
Thanks
Thanks
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Back probe the brown wire at the alternator plug with a voltmeter. It should be something like 3.5V with the key on and engine not running and it should be the same voltage as the alternator output stud with the engine running (in the 13.5V to 14.5V range).
Le Mans Master
Joined: Mar 2004
Posts: 7,493
Likes: 1,502
From: Little Rock AR
Popped a diode trio I would guess. Easy part to test with Ohm Meter and cheap to replace.
Diode trio is what lights the light (and sends power to the excitation circuit as someone here reminded me).
Diode trio is what lights the light (and sends power to the excitation circuit as someone here reminded me).
