Voltage drop

67Dart273 said

Why would you think it is a pump when it could be a bad wire connection or a bad relay?

And why replace the expensive pump when a length of wire can confirm?

Go to anyplace that sells any wire. Look up the pump specs Determine the size wire it needs for the power. Buy say, 20' of wire that is at least one size larger than needed. Wire it temporarily direct from the battery to the pump. If it seems problematic, obtain a multimeter that can handle the pump current and measure it's current draw.

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sorry. Like I said. Just literally re did all connections. The new wire is now 12g From dash to just under trunk. So say 8’or so. Still exact outcome as the 14g wire that was on it before. The exact same pump that is on the motor side if things has the exact same pump and relay. Both relays are working fine and are brand new. Both switches are brand new and working just fine.
Everything about the electrical is as it should from my understand. But one pump only has 10 volts and is making a different noise from. The exact same pump with the exact same setup that is working just fine