On board air - melting relays

[4x4junkie]

no, we told you that the specs clearly state that the max current draw is only at 120psi, and that the amount of current draw is load-related: "Maximum amperage draw @ 120 psi"

he's blowing 30 amp fuses after only 20 seconds of operation, so he's not drawing the max current that you claim is the problem.

is he drawing more than 30 amps after 20 seconds? possibly, but testing the current draw with an amp meter is problematic, because cheap multimeters are usually limited to 10amps max current, and he's certainly over that.

increasing the fuse capacity as you stated would be the simplest approach.



they are both designed to run directly off of the battery, but there was no circuit breaker listed in the specs; crappy documentation leading to confusion, and i don't recall seeing the o.p. mentioning a circuit breaker either... i do see a circuit breaker in pics, next to the on/off switch, that's not on the 2780.

so the only reason that a fuse is needed by the battery would be to protect what's between the battery and the compressor... indeed, this genius hardwired a 2781 in with crimp connectors and no fuses :-/ https://www.youtube.com/watch?v=0mDY8Fxm1K4

There was never a chance for it to reach it's maximum 45A current draw (@ 120 PSI) since the 30A fuse kept blowing long before it could ever get there (using a multimeter seems like a pretty moot point, obviously it was going past 30A after 20 sec if it was blowing 30A fuses).

Clearly a fuse with enough capacity to handle the compressor's max amperage draw is what is needed (which the OP did say he's now looking into getting). So I don't understand what your argument is...


But indeed that genius in the video also has mad editing skill, leaving what could've easily been about a 4 or 5-minute video at over 41 minutes long lol.



And ×2 this:

You likely had high resistance to ground before, so the compressor was not able to draw full power. Now that it's wired properly it is pulling the current that it should be and blowing the undersized fuse.

 

[KSL22]

Purchased a Maxi fuse holder with 6 ga leads off Amazon. I will wire this in once I have a spare moment. So probably in two weeks.