View single post by Mark Rosenbaum
 Posted: 07-17-2006 02:16 pm
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Mark Rosenbaum

Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
As John mentions the cigar lighter wiring is a good source of power for a stereo memory.

For the switched power, the ignition switch has an ACCESSORY position that is generally used to power a factory stereo.  Given the limitations of the ignition switch, it would be prudent to connect this to the coil of a relay, whose contacts would switch power directly from the battery through an inline fuse.  This would allow lots of current for a modern, high-power stereo, without overloading the existing wiring.  You could also power the stereo memory via the wire from the battery.  This arrangement allows stereo use only if the ignition switch is in the ACCESSORY or RUN positions.

I've attached a simple drawing which may clarify things somewhat.

Attachment: STEREO.jpg (Downloaded 271 times)