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I want to hard wire my car mount into my car's fuse board rather than using the cigarette lighter socket/plug. Do I need a voltage transformer between the GPS mount and the fuse board or does the mount reduce the voltage?
Cheers, Pete.

Just for information, in case anyone else was thinking of doing something similar, there's no need for a voltage reducer on the supply in to the 660 .

My apologies, I should have or should be on here more often. But your answer is correct.

Thanks for posting the results for others to see.