I have 1998 Pan/Fam with 12V battery fitted which is not charged when 240V is pluged in, the manual states that the battery must not be switched on when 240V is pluged in.
My problem is the water pump works with 12V battery but when you switch the battery off and use the 240V system every thing works fine except for the water pump which you can here Hum but will not pump the water

I am no electric expert but it seems strange that it works on 12v and the pump still makes a noise on 240v which suggests its still getting a power supply. I wonder if the BIP unit is reversing the polarity when on 240v causing the motor to spin in the opposite direction? try putting a multimeter across the pump terminals to see if the polarity switches over when changing the supply, it will also show if you are getting 12v with each power supply. Hopefully an Eriba electrickery wizard may know

Quote: peebee wrote in post #1

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...the water pump works with 12V battery but when you switch the battery off and use the 240V system every thing works fine except for the water pump

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The caravan is new to me so i do not know if the pump was working from ac before i got it.

I have use a multimeter on the ac side of the system and the pump is getting 13.2v and will run but not push the water up to the tap.

The second fused output is the one that feeds the pump but when you look at the transformer the first fused oulet has a tap sign and the second has the lights sign.