Hi
I had a problem with my MG TF 02 135 not charging when driving up to the Lakes this weekend. The battery went flat as I was driving.
I was stranded so bought a new battery and alternator. With a bit of help from the lovely team at Kwik Fit Kendal, I had the alternator changed and the car back up and running with a voltage of 14.5v when started. I drove home on Sunday. It was very wet, with wipers, headlights and heater fan on for an hour and a half. Lights were dimming after about an hour but no charging light on the dash. Checked the battery and 10.6v across the terminals when the engine was running and when switched off. Checked the alternator fuse. That was OK just cleaned the terminals. The alternator is running with the belt OK, positive feed and D electrical plug fitted. Put the battery on charge for a while. I then got 11.8v across battery terminals when engine running and off. Checked the positive feed at the alternator to earth on the chassis and on the case of the alternator, still 11.8v when engine running or not. So nothing coming out of the alternator. Disconnected the positive feed to the alternator and started the car, there is 0.5v at the alternator output to the alternator frame or car chassis?
What do you think is the new alternator faulty? Any suggestions?