Hi,

I've just been working on my 240D relay. It should be able to switch up to 80Amps on your plugs so I'm sure even with series deals, this should work just as well as a wire touching on the battery.

This relay sends out 4 leads to the plugs that are wired in parallel. The 240D isn't too strong I'm afraid, it may be too "weak", that is, each circuit only handles 1/4 of the current and the connector may not be spec'd to light up all 4 plugs in series.

Good post on the "salt shaker". That is really cool how they engineered that.

My suggestion is to go over to Harbor Freight and get one of their high current battery cut off switches Item 92688 and use that to light off your system, that way you don't risk smoke and fire with your bare wire. Add a 80A mbz glow plug fuse inline for safety. Oh yeah, and don't leave it on This is a hack and not a good resto job but it sounds like you're just building a driver, not a trailer queen.

Cheers,
Yoko