charging problems
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
charging problems
1986 coupe...sorry, haven't had a chance to update my profile since i just got the car a couple weeks ago.
The alternator quit charging, so I picked up a new one and a new belt. Seems to work fine at idle and low rpm, showing 13.5-14.0V. But with a load, such as cruising down the highway, the voltage quickly falls to 11.5 or so and then begins dropping down.
What do you guys think it may be?
Chris
The alternator quit charging, so I picked up a new one and a new belt. Seems to work fine at idle and low rpm, showing 13.5-14.0V. But with a load, such as cruising down the highway, the voltage quickly falls to 11.5 or so and then begins dropping down.
What do you guys think it may be?
Chris
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
Wow, that's pretty bad. This one looked ok, but just wouldn't charge above about 1200rpm....even tested ok on the car. Off the car on their test stand, it failed all of the tests.
C
C
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
alternator
I rebuilt an alternator for a guy once, and same thing, idle to 1000 rpm, it was great, anything over that, .....zip......back to battery voltage.
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
alternator
I rebuilt an alternator for a guy once, and same thing, idle to 1000 rpm, it was great, anything over that, .....zip......back to battery voltage.
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM remember, there's no keyway for the pulley
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM remember, there's no keyway for the pulley
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,606
Likes: 1
From: Las Cruces NM
I rebuilt an alternator for a guy once, and same thing, idle to 1000 rpm, it was great, anything over that, .....zip......back to battery voltage.
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM remember, there's no keyway for the pulley
All I had to do was tighten the nut on the pulley, and Zing!!!! 14.2 V all the way to 5500 RPM remember, there's no keyway for the pulley
Definately good to know for the next time. It's just too bad you can't count on a manufacturer to do something simple like tighten down a nut. Makes you wonder what else they forgot to do with the rebuild.
Chris
