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Message:: [QUOTE="Dino soar, post: 11685486, member: 208212"]I am finishing up the set up with my predator 3500 and now it is time to run the electric lines into the truck. 1st of all what I want to power is a 1500 W space heater inside the truck and I want to buy a timer so that before I go to work my block heater can run for  2 or 3 hours. I'll also use the coffee maker but not at the same time as the block heater or the space heater.  I was going to use 2 separate lines each plugged into the 3 prong outlet one for the space heater and 1 that would switch off between the block heater and the coffee maker. But now I see that Harbor freight sells a cord that goes into the twist lock that I think is 30 amps, and it is a 10 gauge wire.  Could I use just that 1 line running into the truck from the twistlock and use a multi strip outlet with a circuit breaker? How many amps should the circuit breaker be if so?  The other question that I had is that there is a positive and negative connection on the inverter but apparently there is also a ground.  Can I run a wire from the negative connection at the inverter over to that ground connection since that runs back to the batteries and to the frame, , or do I actually have to run a separate wire to the chassis ground?  If I need to run a separate wire what gauge wire do you use?[/QUOTE]