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Battery light stays on

Bulldog

Member
Joined
Aug 4, 2008
Messages
5
Location
Ohio
Corvette
1981 Wht. Coupe
I have a '81 4 barrell. I replaced my battery with a new one and the battery light stays on when the ignition is turned off. Also after replacing the battery now the car won't start. It cranks but it won't start. ;shrug Can anyone tell me why?
 
7

78 Shark

Guest
check for voltage

Hello Bulldog,
Check to see if you are getting 12 volts to the distributer, not the tach wire but the red one when the key is turned on. If there is voltage then the problem could be the module in the distrubtor. Hope this helps.
78 Shark
 

Bulldog

Member
Joined
Aug 4, 2008
Messages
5
Location
Ohio
Corvette
1981 Wht. Coupe
Thanks for the help 78 Shark , I had 11.34 volts but I tried something ,I took a wire and ran it from the positive terminal to the red wire and by passed everything and it fired right up no problem,hooked everything back up and it seams to fire up with no problem,but I'm still having a problem with a battery light staying on when the car is shutoff.I was told 2 things that it could be, 1 maybe a bad ground from the battery to a juction box some where on the frame.2 (I think its called a diode) alternator. When I disconnected the wire from the alternator my battery light did go off,so I'm going to go and get that checked tomorrow,does any of that sound like it maybe the problem?
 
Joined
Oct 7, 2006
Messages
295
Location
South Dakota
Corvette
76 Coupe
i would put my money on a blown diode trio in the alternator.. that will prevent the alternator from charging and may drain your battery. Since it cranks over and starts with the jumper , I doubt you have a bad ground issue.
 

Bulldog

Member
Joined
Aug 4, 2008
Messages
5
Location
Ohio
Corvette
1981 Wht. Coupe
Thanks Curtis,
I'll take it up and get tested today,Thanks again.
 

Bulldog

Member
Joined
Aug 4, 2008
Messages
5
Location
Ohio
Corvette
1981 Wht. Coupe
When going to get a new alternator they asked what amps the old alternator is,I would guess its still the original aternator and I'm not 100% sure.I do have some stuff added like a security system and a after market stereo,stock a/c unit still in there.Does all these make a difference in what amp size i need?And what is the standard or stock amps?;shrug
 
Joined
Jan 1, 2002
Messages
7,246
Location
Washington, Michigan
Corvette
'67 Marina Blue Convertible
When going to get a new alternator they asked what amps the old alternator is,I would guess its still the original aternator and I'm not 100% sure.I do have some stuff added like a security system and a after market stereo,stock a/c unit still in there.Does all these make a difference in what amp size i need?And what is the standard or stock amps?;shrug

The standard alternator was 63 amps, and 70 amps with a rear window defogger.

:beer
 

Bulldog

Member
Joined
Aug 4, 2008
Messages
5
Location
Ohio
Corvette
1981 Wht. Coupe
IT WAS THE ALTERNATOR THE WHOLE TIME,BATTERY LIGHT IS GONE NOW AND RUNS LIKE A CHAMP!!!:thumb
 

Mr. Chuck

Well-known member
Joined
Jan 19, 2005
Messages
230
Location
Southern California
Corvette
1981 Two tone silver / dr grey
I had similar problem on my 81, went to local parts shop, purchased a new diode trio (~$8), replaced same in alternator and no more light problem, if you have experience / knowledge you can saved the cost of a replacement alternator.
 

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