c4 Charging Problem
Thread Starter
Heel & Toe
Joined: Jul 2012
Posts: 19
Likes: 0
c4 Charging Problem
I have used this forum before with great success, so I'm hoping to get some help with this electrical problem. Car is a 1991 and is completely stock. The battery is not always being charged by the alternator (input voltage measured at the battery terminals with the engine running is 11.2v). Alternator is new, but I suspected it could be bad. Removed alternator and had it checked at parts supplier and it tested OK (14.3v
output). Replaced it on car and it starting charging battery (14.3v at battery terminals. Drove car for a week and problem returned (back to 11.2v). Checked with scan tool and no codes were shown. Hoping you folks have some suggestions. Thanks.
output). Replaced it on car and it starting charging battery (14.3v at battery terminals. Drove car for a week and problem returned (back to 11.2v). Checked with scan tool and no codes were shown. Hoping you folks have some suggestions. Thanks.
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 763
clean and double check all your battery connections, as well as alternator connections. make sure you have a good ground to the engine block. if need to, run a temp ground - battery to engine. since the alternator checks OK, give the battery a check. time to dig out the FSM.
edit: need to ask - original alternator? OE should be P/N 1101601 (105A).
edit: need to ask - original alternator? OE should be P/N 1101601 (105A).
Last edited by Joe C; Jul 26, 2016 at 06:39 PM.
Melting Slicks
Joined: Jul 2016
Posts: 2,611
Likes: 46
From: Pine Bush New York
charging
I have used this forum before with great success, so I'm hoping to get some help with this electrical problem. Car is a 1991 and is completely stock. The battery is not always being charged by the alternator (input voltage measured at the battery terminals with the engine running is 11.2v). Alternator is new, but I suspected it could be bad. Removed alternator and had it checked at parts supplier and it tested OK (14.3v
output). Replaced it on car and it starting charging battery (14.3v at battery terminals. Drove car for a week and problem returned (back to 11.2v). Checked with scan tool and no codes were shown. Hoping you folks have some suggestions. Thanks.
output). Replaced it on car and it starting charging battery (14.3v at battery terminals. Drove car for a week and problem returned (back to 11.2v). Checked with scan tool and no codes were shown. Hoping you folks have some suggestions. Thanks.
