Forum Discussion

blueh20's avatar
blueh20
Explorer
Oct 21, 2018

10ga or 12ga help wanted

I am mounting a new flojet water pump on my 2014 ford e250 conversion, the pump says 7.5 amps at 50psi.

The instructions that came with the flojet says to run 12ga up to 50ft.

I have a 23' run, thats from the battery thru the fuse block to the switch then to the pump.

running 8ga from battery to fuse block which is 5' away, running a 30amp breaker on the fuse bloc.

I was planning on running a 10ga loop which equals 46', the 3 elec. male slide on connectors built into the switch are to small to attach 10-12 ga female connectors to, they wiggle when attached and are too narrow for a good fit.

The other option is to just run the 12ga for the 23' and ground the pump to the vehicle right next to the pump..

All my other wiring in the conversion I have done as a loop back to the fuse block.

Blue Sea systems chart says 8ga for a loop. Most charts say 10ga for a loop and found one that says 12ga loop.

Looking for input and comments from experience..

thanks
  • Lwiddis's avatar
    Lwiddis
    Explorer II
    Oct 22, 2018
    The price difference is minimal? Opt for the larger wire. Follow manufacturer’s specs.
  • GordonThree's avatar
    GordonThree
    Explorer
    Oct 21, 2018
    My water pump is installed with 14ga wire from the factory, probably about 18 feet as a loop, and I wish it were heavier gauge. Measured at the pump there's quite a voltage drop on that circuit while it's running.

    I almost had myself talked into replacing it with 10ga but that'd involve cutting the underbelly.

    My thought is, since it's an electric motor, lower voltage does it no favors.

    As far as using a chassis ground for the pump, I don't like using one for anything more than a few amps. Don't have any evidence that its a problem, just my preference.

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