Alternator not charging

Uplander · Sep 5th, 2018, 09:01

Hi
I have a 1969 1800S (B20) with a SEV Motorola Alternator and don't have any charge going to the battery.
The battery is fairly new and I have a shut off switch fitted on the negative side which I always use when putting the car away in the garage. The AMP light hadn't been coming on when turning on the ignition and on investigation one of the piggyback connectors had come off the external regulator. Now the AMP light works but stays on when the engine is running.

Voltage tests as follows:
With engine off:
Battery (not fully charged) 12.1v

With engine running:
Battery 12.1v
Alternator cable to starter solenoid 12.1v
Alternator connection from regulator: 0.89v

There is no change in voltage when engine speed is increased.
I've looked at Ron's tests for a Dynamo and VR, but not sure if these apply to Alternator set up.
What's the best way to determine whether it's the alternator or the regulator that is at fault?
Thanks
Simon

Sep 5th, 2018, 09:01	#1
Uplander Member Last Online: Apr 16th, 2024 17:09 Join Date: Jul 2016 Location: Bridport	Alternator not charging Hi I have a 1969 1800S (B20) with a SEV Motorola Alternator and don't have any charge going to the battery. The battery is fairly new and I have a shut off switch fitted on the negative side which I always use when putting the car away in the garage. The AMP light hadn't been coming on when turning on the ignition and on investigation one of the piggyback connectors had come off the external regulator. Now the AMP light works but stays on when the engine is running. Voltage tests as follows: With engine off: Battery (not fully charged) 12.1v With engine running: Battery 12.1v Alternator cable to starter solenoid 12.1v Alternator connection from regulator: 0.89v There is no change in voltage when engine speed is increased. I've looked at Ron's tests for a Dynamo and VR, but not sure if these apply to Alternator set up. What's the best way to determine whether it's the alternator or the regulator that is at fault? Thanks Simon

Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)