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Message: <blockquote data-quote="Stel" data-source="post: 4172913" data-attributes="member: 574698">That is something to watch out for, most cars go with the cheapest method which is a simple switch on each door. But if IC's are involved a diode should be also be placed in series between the new 12v + feed and the path back to the integrated circuit to prevent current flowing in that direction. Or use a relay, I like avoiding relays unless needed since they are mechanical devices and more likely to fail at some point, and it's a bit more wiring. Though with the currents involved, it may be easier in this case just to go with some relays.I think he already has a switch installed, a fog light switch and I assume he wants independent control from the dome light.</blockquote>

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