I'm looking to add a 4awg cable from the battery up front to an anderson connector at the tail of the truck to provide additional power to my trailer. Normal power draw would be less than 50 amps. I have a dc breaker on the trailer for the incoming power, but figured I would add a fuse between the battery and cable.

Now for the part I'm unsure of. I was thinking of making a set of jumper cables to plug into the anderson connector too. Putting a fuse between battery and cable, on the truck side seems like it would just blow too easily if I tried to jump someone.

Should I just go without a fuse there since I'll have one on the trailer side? Or is a megafuse slow blow and would, say a 200amp fuse, support the brief burst from a jump?

  • 1
    A jump can be 400 to 600A, even more for some trucks.
    – Solar Mike
    Jul 8, 2021 at 21:13
  • Welcome to Motor Vehicle Maintenance & Repair! I agree with Mike ... even 200A fuse seems mighty slim. Jul 8, 2021 at 21:28
  • Should I just go without a fuse then, and rely on the dc breaker on the trailer?
    – dave k
    Jul 8, 2021 at 21:35
  • Just wasn't sure if it was a slow blow fuse, if it would last at that high of amperage for a brief burst
    – dave k
    Jul 8, 2021 at 21:38
  • 1
    These days having a jump pack in the truck is easier. But, personally, I put a fuse on the battery-to-rear wiring - I just don't like having an un-fused wire. The total length of wire from the battery to the back, and then the back over to another vehicle makes for a lot of heating losses on the way.
    – Jon Custer
    Jul 12, 2021 at 15:29

1 Answer 1


You could have a fuse for the truck .Check the tripping time specs for the fuse .You will find that short overloads will not blow it .I have not done this but think that a fuse of between say 200Amps and 400 Amps would be a starting point .

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