Help req fitting sat nav

[glock17]

I had planned to wire my nuvi 360 into the lights above the rear view mirror so the unit would sit high beside the rear view and I wouldn't have a cable trailing around the dash. The coonector for the sat nav would then come out through a hole drilled beside the passenger sun visor (previous owners' work).

It's a 12v supply which is then stepped down to 5v DC.

I did all the wiring taking the feed from the lights. The problem is the unit that does the stepping down draws power.
If the ignition is on there is no problem and/or when the lights are on there is no problem. As soon as either is switched off there is a relay somewhere in/behind the glove box that's constanly opening and closing every second, not good for the relay.

Does anybody have any suggestions of a work around and/or any wiring diagrams?

Any suggestions of alternatives would also be greatly appreciated.

Cheers.

glock17

[robin]

you could put a swich in to cut off the power from the lights to the step down unit
put swich where the mike should go on light unit

cheers

robin

[glock17]

Thanks Robin. May do that.
I've also thought about extending the cable and running in under the drivers' floor mat and up behind the trim to mount the unit in the little window by the A pillar.

Cheers

glock17