Voltage Problem

[MF73CUDA]

Hello, We Have A 95 Lasabre,with A Rebuilt Delco Alternator 140 Amp,i Had A Generator Shop Disassemble It And Check To Be Sure, And A New 1000 Amp Battery. I Checked And Cleaned The Battery Connections And The Grounds Behind The Battery,and The Volt Light Still Comes On.it's Around 11.7 Volts.i Checked The Field Wire And There Is Almost No Voltage Coming From It,when I Put A Jumper Wire On The Alternator It Goes Over 14 Volts.what Is This Field Wire Hooked Up To? Any Ideas?

[LeSabre97mint]

Originally Posted by MF73CUDA

Hello, We Have A 95 Lasabre,with A Rebuilt Delco Alternator 140 Amp,i Had A Generator Shop Disassemble It And Check To Be Sure, And A New 1000 Amp Battery. I Checked And Cleaned The Battery Connections And The Grounds Behind The Battery,and The Volt Light Still Comes On.it's Around 11.7 Volts.i Checked The Field Wire And There Is Almost No Voltage Coming From It,when I Put A Jumper Wire On The Alternator It Goes Over 14 Volts.what Is This Field Wire Hooked Up To? Any Ideas?

I believe I know which wire you're talking about. Is it the smaller wire on the alt? I know on my Windstar that smaller wire was loose and the Alt light would come on once and a while. I was ready to replace the alt. I got the idea to wiggle the wire. The light went out. FYI

I would give the Gen shop you had check out the Alt a call. I'm sure that they would know.

You could also
Regards

Dan

[MF73CUDA]

Originally Posted by LeSabre97mint

I believe I know which wire you're talking about. Is it the smaller wire on the alt? I know on my Windstar that smaller wire was loose and the Alt light would come on once and a while. I was ready to replace the alt. I got the idea to wiggle the wire. The light went out. FYI

I would give the Gen shop you had check out the Alt a call. I'm sure that they would know.

You could also
Regards

Dan

HELLO, THANKS FOR THE ADVICE! BUT WE HAVE BEEN PLAYING WITH THAT WIRE FOR A COUPLE OF DAYS. THANKS AGAIN, MIKE

[yogi_123rd]

Something to check:

I've had my head aches with new alternators not charging in the past on other type cars (fords).

Most (american) charging systems use a fusable link as the fuse to protect the battery. If an alternator spikes voltages, you want some type of protection so as your battery don't get fried.

The fusable link is a wire that acts as a fuse - it melts. Typically, it is in the wire from alternator back to the battery and it is crimped in. These have been known to blow when an alternator seizes up.

[MF73CUDA]

Originally Posted by yogi_123rd

Something to check:

I've had my head aches with new alternators not charging in the past on other type cars (fords).

Most (american) charging systems use a fusable link as the fuse to protect the battery. If an alternator spikes voltages, you want some type of protection so as your battery don't get fried.

The fusable link is a wire that acts as a fuse - it melts. Typically, it is in the wire from alternator back to the battery and it is crimped in. These have been known to blow when an alternator seizes up.

HELLO,I CHANGED THE ECU AFTER LOOKING AT THE CHARGING SYSTEM SCHEMATIC,AND NO MORE VOLT LIGHT!

[kram5527]

You might try the following:

1. According to the haynes manual, one of the field wires is directly connected to the battery -- someware -- check for breaks in the wire.
2. The second wire connects to some moderate resistance circuitry but should also be at the same voltage as the battery. -- also check for breaks.
3. Check the mounting of the alternator for a proper ground -- but by your tests it is properly grounded.
4. Check the output lug of the alternator and positive terminal of the battery with a voltmeter to ensure that they are at the same voltage, if not, replace the wire.