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I took these off to 2 things (fuses?) to clean the contacts. The underside of each of these have a copper base and a regular metal base. I lined them up. Copper on one side, regular metal on the other.
Is that correct or irrelevant?
I'm pointing to the base in question.
Also does it matter under which nut this small red wire goes?
It is not recommended to put two breakers (or fuses) in parallel as it does not reliably double the capacity.
If I’m seeing correctly, with the bus strip attached to both terminals (+ to + and
- to -) of both breakers (parallel) you could attach the wire to either screw on that bus.
But I agree with the above post, to replace with a single breaker, at the required amp rating.
Agree with everyone advising to just go get the correct rating circuit breaker for the load and get it done right.
Here's one at NAPA for less than $5.00, rated at 40 amps and has mounting tabs for a more secure installation just for an example. I use them all the time for protecting the charging circuit on auxiliary batteries so a deeply discharged battery doesn't overheat the alternator. https://www.napaonline.com/en/p/BK_7823116
Copied, pasted from a Google search on the polarity of those circuit breakers:
A 12V auto-reset circuit breaker is wired in-line on the positive (red) wire between the battery and the accessory. The "BAT" (or "LINE") stud connects to the positive power source, while the "AUX" (or "LOAD") stud connects to the device, protecting against overcurrent by cycling power until the overload is removed.
Last edited by Kwikkordead; Apr 19, 2026 at 09:58 AM.
Ok so then this is not factory? I'm quite surprised because this was a company truck and they didn't add anything to the truck.. Unless it was tow hitch related...hmmm....
Need to run down that wire.
All this time I assumed it was factory... Or installed by Ford dealer.
It is not recommended to put two breakers (or fuses) in parallel as it does not reliably double the capacity.
If I’m seeing correctly, with the bus strip attached to both terminals (+ to + and
- to -) of both breakers (parallel) you could attach the wire to either screw on that bus.
But I agree with the above post, to replace with a single breaker, at the required amp rating.
That’s pretty good size cable….. I ran something similar to my truck bed
with 6AWG and a 60 amp breaker by the battery for my Victron 12/12/30 DC to DC charger to maintain my 280AH LiFePo4 battery in my truck bed camper.
almost makes me wonder if yours wasn’t for a pull behind camper or work trailer with its own house battery
Last edited by Big Horn 2; Apr 19, 2026 at 06:52 PM.
If your not using it I would just unhook it all and remove the breakers all together at the battery. Leave the power cable in place ran to the back incase you ever need it for future mods.
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