Help with connecting to battery

[TheMatrix]

I'm trying to connect a booster for my TPMS directly to my 2 x 6v Trojan batteries. I put one cable on positive and the other on negative on the other battery so it's 12V circuit.

How the heck to I do this without getting sparked all the time. I'm really spooked out by this lol. I just don't want to damage any components.

Any help would be greatly appreciated.

Thanks.

[TheMatrix]

Never mind. I'm an idiot. Forgot to unplug from my 120v power outlet.
What an idiot! Lol

[lynnmor]

Use your battery disconnect switch, you do have one, right?

[rarebear.nm]

I added a fuse block and grounding buss bar (from Home Depot) on the load side of the battery disconnect switch. This makes it simple to add various electrical mods avoiding a tangle of wires and fuses, etc. Make sure you also put a larger (perhaps) 50 Amp breaker between the fuse buss an dthe disconnect switch.