Upgrade water pump wiring?

GordonThree wrote:
Has anyone measured the voltage at their water pump while it's operating?

I'm seeing ~6 amp load and about 10 volts with the pump running wide open (multiple taps opened.)

Battery voltage is at 13.2, as provided by my temperature compensating charger (ambient = 80F)

A 3 volt drop seems high to me. Wiring to the pump is 14 gauge.

Thinking of putting in a dedicated 12 gauge run to the main fuse panel. No idea how many branches the wiring Elkhart put in has, or how many staples they put through it.

USCG / ABYC says max 10pct drop, but their charts show 14 gauge wiring is enough. Does RVIA have a similar standard. Do SAE standards apply, since an rv is considered automotive?

I can't say what the mfg says it should be but our pump pulls up to ten amps and ahs either ten gauge or eight gauge wiring.
Fourteen gauge sounds small, and certainly will be if you put in a higher output pump.
Check the manual, for the pump, and see what it recommends, for minimum wire size, and consider the length of run.
Not sure how they are wired. Ours has four different switches, to tun pump on but there is only one pressure switch and it is on the pump.
The power supply surely should be greater than 14 gauge.
The wire to our pump is either number 10gauge or 8gauge probably 10 gauge.