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MG MGB Technical - HEADLIGHTS ON RADIO GOES OFF

1971 MGB.
All works well until headlights turn on then radio goes off.Turn light off and radio comes back on.
This radio has removeable face but I believe that's not the problem.
Any and all help is appreciated.
Sandy
ss sanders

Sandy, it sounds like a poor ground connection, at the radio, to me. RAY
rjm RAY

Where does the radio get it's 12v supply and earth connections?

Does the radio have a dial light? Does that go off as well? Or stay on but the sound cuts off?

Does the radio have a 12v supply fuse? If so it's easy to check the voltage between that and the radio case.
Paul Hunt

Has the radio recently been fitted, or any other changes made?

I was once asked to help with a car which was showing the same symptoms as yours...the radio only worked as long as the lights were off.

It transpired that whoever fitted it had connected the ground wire to the panel light circuit. While the lights were off, the radio was earthing through the panel lights, but when the lights were switched on, there was 12v on the radio ground.
Dave O'Neill 2

I will be pulling the radio later this week. I will then tell all.
Sandy
ss sanders

This thread was discussed between 27/06/2014 and 02/07/2014

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