tomagain wrote:
A friend of mine was cleaning his mobile radio. When he went to plug
the power back in, the middle pin (offset) was loose and pushed back
into the radio, allowing him to put the connector in backwards. (hot
to ground) This killed the radio. (he had no inline fuse at the time)
I told him I would look inside of it for him. Once inside I found
nothing burnt. After fixing the dummy pin, and connecting power with
the correct polarity to a D.C. power supply on my bench, the radio
still wont come on. When I started checking for voltage, I found that
I had 12 volts on the chassis. It is on both sides of the on/off
switch with the switch off. The 12 volts is everywhere. Does anyone
have any ideas about what to check next? It is hard to use the meter
when everywhere shows 12 volts.... Thanks, Bill

It's the reverse polarity diode. (hopefully)

Frank might know the repair.

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