alternator relay has a "capacitor" attached whats its name so I can buyit and how can I test it@


Asked by May 15, 2017 at 07:38 AM about the 1963 Ford Thunderbird

Question type: Maintenance & Repair

I have a red light on the dashboard  ( the charging light) that should go out
when I actually start the engine but it stays on, a local garage says the
alternator is fine and slightly overcharging at 14.5 they asked me to get a new
alternator relay, I did this, this still doesn't allow the light to go out, the only
thing left is ??? comments please and is it possible for the small capacitor
attached to the relay to be faulty ( how to test??).
Any other suggestions please

2 Answers


A 63 Tbird does not have an alternator relay, thus vehicle should have a generator, unless it has been modified. But even still I think your talking about the voltage regulator and the capacitor your looking at is actually a noise filter to help with the generator noise or whine in the radio, the charging system will operate just fine with or without that device. Did you polarize the replacement voltage regulator if it still has a generator? If it has an alternator then you will need to check the wiring to make sure it was modified correctly.

1 people found this helpful.

There would have to be a regular 12 volt alternator on there to produce 14.5 volts, which is perfect charging voltage. The reason for the light on the dash would be with the voltage regulator for the alternator, or the instrument cluster voltage regulator, and possibly there is a wire broke, or came off somewhere.

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