ISUZU-Trooper Rear Power Outlet Install

Details of wiring in a rear accessory socket and power to windows and roof in ACC mode:

Well you can't always get what you want  but I was able to make the windows run with the key in the ACC position in addition to the ON position and I got a great outlet in the back. Both mods were done correctly in that there will be no electrical problems as a result. For those interested in how I did it read on... 

1st the accessory plug. I ran 10ga. (I know, overkill)  from the front to my outlet (just above the jack compartment). I ran it inside, under the trim and adjacent to the stock harness. To hook it to the electrical source remove the fuse block (2 bolts, 1 nut) and leave it hanging on the wires. Locate the cigarette lighter fuse. On the back side of that fuse you'll see an 18ga wire that runs to the lighter and a 12 ga wire that feeds the fuse and the other accesories that power up with the key in ACC. The fat (12ga) wire comes from the underhood acc. relay and can safely handle a hefty load. Wire an inline 15 or 20 amp fuse (I suggest right there in case your wire running to the back became chafed and shorted) and solder it in. I always prefer soldered connections... Next make a short ground strap from the lighter outlet to one of the nuts that holds in the jack mounting box. DONE  Note: The installation I described will power on&off with the key (to ACC or ON), it's not hot all the time which is what I wanted. Now the windows. While the fuse panel is still unbolted locate the power window relay. On the relay itself you'll note a diagram showing that one side (the 2 fat wires) is the switch and the other side is the coil to close the relay. With a voltmeter determine which of the 2 small wires has power when the key is ON and loses power when the key goes to ACC or OFF. Cut that wire and jump it to the cigarette lighter feed wire. Cap the other end (the end going back into the trucks wiring harness). DONE 


Now the windows will operate with the key in ACC. And it's all fuse protected and given that the only power your taking is a minute amount to close the relay there are no worries of overloading anything. Hope this is of interest.

Chris L.

Thanks to  for this detailed article!
Last updated on 01/29/2002 10:15 PM