I have lots of aftermarket electric gadgets in my carfog lights, rear window defogger, cruise control, gauges, wiper delay, etc. It didnt take long before I had to install an auxiliary fuse box. Since I didnt want to run the box and an extra 20 amps or more through the ignition switch, all those accessories could be turned on and left on with the engine off.|
Though an engine-off/appliance-on alarm helped with the rear defogger (the only device you couldnt see working that also drew a lot of amps), it was still possible to drain the battery overnight with even a relatively small load. And mechanics (even I dont do my own front end alignments) always seemed to find a reason to randomly turn switches on and not turn them off again.
The solution, of course, is an auxiliary fuse box relay. It runs off an accessory fuse on the main box, so everything on the auxiliary box stays off unless the ignition key is in the on or accessory position. And the relay doesnt add a significant load to the ignition switch.
Without further ado, here is the schematic. All parts are easily found at an electronics or auto parts store.
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