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MG TD TF 1500 - Erratic Voltmeter Reading

Re: 1954 mgtf 1250
While checking the voltage across my battery with engine running, to check operation and output voltage from my charging system, I am getting strange readings.
Normally, I read the voltage and it will give a stable reading - but now, the digital meter readings fluctuate (flash) rapidly and it looks like a couple of the readings are in the 14 V range and I also see a 18-19V readings. I tried a new meter with same results. Q. Do you think my generator is the problem or the voltage regulator?
Please help.
EWH Haynes

If you have a regular mechanical voltage regulator the voltage will constantly fluctuate probably enough to drive a digital meter crazy. Try measuring with an analog meter.

J. K. Chapin

Also, the EMF radiation from the ignition will interfere with a digital meter. Use an analog (moving coil) meter.
Lew Palmer

I can't use a digital meter on the TF, only analog. PJ
PJ Jennings

Thanks for your input. The analog meter is working. Occasionally, I get good readings from digital (must have been lucky).
I realize now, with your comments, that those readings I was used to getting on the digital were done on my other British cars that do not have the mechanical regulator.
Thanks so much!
EWH Haynes

This thread was discussed between 08/04/2019 and 09/04/2019

MG TD TF 1500 index

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