porschesick

ScootCherHienie

Does your car have a second battery under the cargo floor? If you do have the second battery and it has an internal short in a dead cell, it could quickly drain a new battery... though it would probably get pretty warm doing that in minutes or hours.

Petza914

Got a pic?

slavie

Anything yellow is for airbags. That's likely the airbag circuit breaker - when the airbags go off, the circuit breaker cuts off the power to reduce the chance of electrical fires after the crash.

Like others said, early Cayennes like yours (esp the V8 ones) came with two batteries - main one under the driver's seat, and starter battery in the trunk. Which one did you replace?

porschesick

thanks for reply
my 04 has only one battery under the seat

porschesick

have 04 cayanne s
have a blown fuse (15 amp 32 volt)located under hood on driver side near windshield
can someone tell me what it goes to
thanks

deilenberger

Hi - welcome to the forum.

I'm guessing that you're the fuse you're talking is in what's called the "waterbox" fuse panel, located under the pull-out panel on the engine compartment surround? There should be a map of the fuse numbers on the inside of the cover of the fusebox - with numbers. If you give us the number of the fuse - we can probably help. There are many 15A fuses used in a Cayenne (and 32V just means that it's good in a 32V circuit) - so more ID would be helpful. Perhaps a picture of the fusebox with the blown one highlighted or circled?

porschesick

thanks for welcome and reply
here are the pictures

deilenberger

Looks like a fuel pump fuse..

deilenberger

You probably have a bad fuel pump - which can be checked by tipping up the rear seat, - look for the cutout lines in the carpet under the seat, cut out the left side part if it hasn't already been done, then unscrew the cover revealed under it. That will bring you to the top of the fuel pump (left - port - side according to the diagram) - unplug the wiring to it, replace the fuse, start the engine - if the fuse doesn't instantly blow - the fuel pump is shorted.

If it does immediately blow - then it's possible (but rather unlikely) that the relay is causing the short, or some wiring is shorted. IIRC the fuel pump relays are in the same "waterbox" - unplugging both - then replacing the fuse - and turning the ignition on - should determine if the relay is causing the fuse to blow. Swapping the relays would be another check.

Unless the blown fuse you show in the photos is one you installed - that circuit has had problems before. That fuse is unlike the others - which are undoubtedly the original fuses.

Finally - if the pump nor relay are the source of the short - you're left with tracking the wiring. Not a job I'd envy.

My WAG - pump.

porschesick

thanks for reply
will check per your instructions