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      10-03-2012, 08:51 AM   #14
Nesquik15
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Drives: 335xi
Join Date: Sep 2012
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Quote:
Originally Posted by JamesM3M5
Also check the ground wire from the pump to the front timing case cover. There is a short ground wire that terminates to a ring terminal on the front of the engine block.

The power for the water pump comes right from the top of the battery junction block as stated above. Check all the battery junction block connections. Some are snap-in, some are 13mm nuts.

My thermostat connection (MAP Cooling) wires have been hitting the subframe during hard acceleration. I had to de-pin the connector and put moisture seal heat shrink around it to protect them from hitting the subframe. It looks like the orange power wire (0.5mm) from the Junction Box (fuse 78 or 37 depending on your build date) powers the electronics in the water pump AND the MAP cooling in the thermostat. If that wire shorted to the subframe, it will pop the fuse.
Great info!
Where is that 78 or 33 fuse located?
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2008 335XI//JB4 G5 ISO//AFE STG2 INTAKE//M6 18"//BLACKED OUT TAILS//BLACKED OUT TRIM//