GU Battery Charging Issue

Ok, we are back to the connector at the alternator. I know why you don't want to do this because it is a real PITA to get at with the second battery fitted.

You need to make sure the plug is fitted all the way into the alternator, they are very tight. If this is ok, you need to disconnect the plug and check for power with a voltmeter in both wires with the ignition on.

Don't reconnect the plug just yet, let us know what the results are first.

At the moment your alternator is not charging, this could be due to a faulty alternator or a problem with the wiring.

Ok, I have unplugged and tested with ignition on and nothing. I am getting nothing at all. What does this mean?? Thanks Ben

There is a fuse in the fusebox under the bonnet fuse 47, make sure this is not blown.

You need to remove some of the tape and insulation from the wires near the connector and make sure the wires are not broken.

Thanks, a little help with fuse 47. My fuses arent numbered. What is this fuse for?? Trying to find it but having trouble. Thanks

On the plastic fuse panel cover it is labeled as " ALT S " and is a 7.5amp fuse, it's the next one up from the hazard light fuse.

It is the alternator sense circuit fuse, this is how the alternator knows what charge the main battery is getting.

If this fuse is blown if will only account for why one of the wires doesn't have power in it.

Fuse is fine. Just replaced it and tested from plug of alternator with ignition on and still nothing. I have pulled the tape off the plug and wires are all intact. Any other ideas. ???

You are checking vehicle side of the connector?

There is no common connector that both these wires run through. So you will need to follow the wire harness back from the alternator looking for any signs of damage.

I have attached the wiring diagram hopefully this helps.

Hi Do you have a diagram legend so i can find the fuses ect on the vehicle. I am just going back through everything. I am trying to find the M143 just to eliminate the issue with this one. (If this all fails i am going to grab 2 new batteries and try them).

Thanks Ben

M143 is the connector at the back of the instrument cluster.

I think you might need to take the vehicle to an auto electrician.