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Prewired from the vendor?  From the vendor my Pentaflex pumps have never come prewired.  Who is the vendor? I have never had problems with Pentaflex pumps so long as you do not use too small of a tip.  I am running 10 gauge copper wire that is 6 feet from the battery.  Pentaflex pumps blow doors on any other 12 volt pump that I have used as they are better built.  The ones that I buy do not have a fuse as they come with a circuit breaker.  Try jumping across the fuse.  Measure the voltage at different points.  In a SH environment everything gets corroded.  Make sure all non insulated connections are greased well with electrical grease.  Corrosion can cause a high impedance circuit that will draw too many amps and can over heat the motor.  I have found wires that had corroded all the way through the wiring within the insulation and you could not tell it except there was no voltage.

Maverick Contracting wrote:

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thanks Marcus, I havent had time to call the vendor, been extremely busy and vendor was closed yesterday when i called but he pre wires the units. fuse never blew. no corrosion but will rewire with thicker better wire and see if that works

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 Also, the one few things I don't do is electrical work, been zapped too many times! but if I go bigger more strained wire like good qualtity audio wire do I need to up the fuse amperage?

Maverick Contracting wrote:

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Maverick Contracting wrote:

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thanks Marcus, I havent had time to call the vendor, been extremely busy and vendor was closed yesterday when i called but he pre wires the units. fuse never blew. no corrosion but will rewire with thicker better wire and see if that works

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 Also, the one few things I don't do is electrical work, been zapped too many times! but if I go bigger more strained wire like good qualtity audio wire do I need to up the fuse amperage?

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 19 years ago I was an Electrical Engineer.  I got laid off and ended up in this business.  A finer gauge wire will conduct electricity more efficiently but is not necessary for the Pentaflex pump.  I am running 10 gauge wire that you can buy at your local hardware store.  I you do want to pay more money for a finer gauge wire there is no problem and you do not need to use a heavier fuse.  I recommend using the circuit breaker that comes from the manufacture.  Every Pentaflex I have bought for the last 2 years comes with a circuit breaker from the manufacture. 

I did have a problem with one of my first pentaflex pump when I tightened the positive terminal to the base plate of the pump too tight.  I had to buy a new baseplate to fix it.