Factory Five Racing Forum banner
1 - 5 of 5 Posts

·
Junior Charter Member
Joined
·
875 Posts
Discussion Starter · #1 ·
Strange?

this isn't on my roadster but since most of us use mustang parts I figured this would be the place to ask.

When I first start my car the lights are bright and the gauges read where they should. After about 10 minutes of running when the engine's warm the light dim a little and the gauges seem to read alittle lower. Performance isn't affected but the dash lights are pretty hard to read.

It's a stock '83 with the external voltage regulator.

Thanks again
 

·
Charter Member
Joined
·
3,866 Posts
Check your alternator output voltage at the battery.
If it reads above 13.5 volts, check your grounds.
 

·
FFCobra Fanatic
Joined
·
12,975 Posts
Sounds like the alt is not chargeing. Check the charging system. You find charging system is up to par,look for bad ground on the dash. You can do a quick check to see if ground is the problem by useing a small jumper wire and clip one end to chassis ground and other end to dash metal.
 

·
Registered
Joined
·
3,408 Posts
Headlight switch is a notorious POS in the Mustangs. Not sure the 83's had the same issues as 87 to 93 though.

My first thought was underdrive pulleys. They don't fully charge the battery at idle and you'll loose charge if you let it idle for too long with the headlights on. I used to have this problem on an 87 Mustang.
 
1 - 5 of 5 Posts
Top