I just got my first 12V diesel heater and am relocating the fuel pump (pictured below). In the process, I clipped the two wires for the pump before I had them labeled properly. And because it's a cheap Chinese diesel heater, the wires are colored exactly the same, and I can't tell them apart.

1) Polarity wise, does it even matter that I may have mixed up the wires?

2) If so, how can I tell if I have the wires crossed when I hook it back up?

Thanks

 

Hello,

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Bertus

 

The heater likely doesn't care about polarity.
The fuel pump may.

 

Are the on the same fuse? If not, just take out 1 of the fuses and see which one loses power.

 

If its one of these Chinese Diesel heaters then the polarity is not important.