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MG TD TF 1500 - TD Ammeter

I have an original Lucas ammeter +30-30 which does not respond. I have it connected correctly via the A terminal on the regulator and the starter switch battery connection. Because it failed, I thought I would try another Smiths black faced spare ammeter which I have, however the Smiths ammeter needle only moves slightly.
Does anyone have any ideas as to what I am doing wrong or is it possibly the regulator ( early Lucas 9 post type) ? or maybe both ammeters are faulty.
Any help would be appreciated.
John Walton

John there is a thread in the archive called "Testing Ammeters" which may help. Cheers
Peter TD 5801
P Hehir

Thanks Peter.
John Walton

Peter, thank you for including the title of the thread. I'm facing the same issue. A very helpful response indeed.

TW Burchfield

In case you didn't find the thread in the archive, as I didn't, the actual thread name is "Testing Ammeter" (no s at the end).

Must be an Australian thing :-)

TW Burchfield

Any Ammeter can be tested easily when disconnected from the car wiring:
Battery+ to headlight bulb+, bulb- to ammeter, ammeter to battery(-).

1 Headlight bulb should show around 5 amps, 2 in parallel (or use dip and high beam in parallel) around 10 amps. That should be sufficiently precise to check the meter. If it does not move enough, the meter has a problem.

Rgds, Mike
Mike Fritsch

Great Mike,
I will certainly try your suggestion today.
John Walton

This thread was discussed between 23/03/2016 and 25/03/2016

MG TD TF 1500 index

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