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91 Subaru XT6 Grounding out
Posted 06 November 2013 - 12:16 PM
Had problems with headlights one night, dim, not popping up, and the battery drains over night. Unplugged most of the wiring harness, checked fuses, and now getting feedback to alternator, melting black wire with white stripe. Furthermore, if you disconnect the negative post on battery, clamp/ground test light to body and touch negative post, light comes on which means there is a short to the body or engine showing about 9 volts.
Posted 06 November 2013 - 02:13 PM
Time to start pulling fuses one at a time to narrow down the faulty circuit. I have a couple of XT6 AFM. Can't remember now what it is called but on the left side of the throttle body that regulates the idle. IAS? Should have a few of these also. Pretty sure there is a diode somewhere in the charging systems there to prevent the battery draining back into the alternator.
Posted 06 November 2013 - 02:59 PM
Thanks for your input John, I still believe it is shorting out somewhere, but it is running properly. I was told it was the IAC, but it was the MAFS.
Still working on short.
Posted 08 November 2013 - 09:22 AM
Posted 08 November 2013 - 11:22 AM
do you have anything custom or currently not working properly? that would be a good place to look for drains.
it's pretty easy to diagnose and narrow down a drain - the final step may be cumbersome but this much is easy:
remove positive battery cable. put a multimeter between positive battery terminal and battery terminal cable.
set it to milliamps.
tell us how many milliamps it's drawing. more than 50 and it's got a drain.
start disconnecting fuses until the drain drops to much lower - that will isolate your drain.
try disconntecting alternator too and see if draw decreases.
you don't want anything to turn on (lights, door opening, seat belts retracting, etc) while testing as it'll draw a bunch of current and blow the fuse in the multimeter
once you find the fuse then it gets a little trickier - look up everything run off that fuse and start unplugging each item one at a time until the drain drops.
i just did this a couple weeks ago and it was the power seat belt controller on a friends XT6.
i may have a set of XT6 manuals available.
Posted 08 November 2013 - 03:00 PM
Posted 08 November 2013 - 05:16 PM
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