PianoTuner has good thoughts so read his carefully. Some very random thoughts, I bought a liftgate plug, it is one big chunk of hardware. I ended up using a Anderson Connector. I'm using #4 with a Carquest "85" amp continuous duty relay that really only carries 65 amps-Cole Hersee is the brand, I will carry a spare, but then going to South America. On my '99 Ford I couldn't get a fuse tap to work with the mini fuses so had to put in a relay as the only circuit tapped into was a main motor control circuit and I didn't want to add more load to it. On our GMC the wiper motor circuit near the drivers door is a good one to tap. The other day with the inverter running the microwave(about 115 amps) I cranked up the motor and the alternator was sending over 80 amps to the batteries-last time for that experiment. With my 115/130 amp(not sure)alternator, 4 gp24 deep cycle batteries at 40% and the motor at 1500 rpm it was sending back about 45 amps. Bought most of the stuff on EBAY. Blue Sea Systems has good info and electrical equipment for the expensive yacht trade,
