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Old 05-22-2020, 01:48 PM   #1
GK1707
Scooby Specialist
 
Member#: 373868
Join Date: Nov 2013
Chapter/Region: Tri-State
Location: Queens, NY
Vehicle:
2004 STi
WRB

Default STi Rear diff ground harness question/option?

04 STi, my rear differential grounding connector has corroded and broken off and has been off for about a year. Has never had any issues with it beside the "diff temp" light on the dash.

I was wondering instead of running an entire new oem temp sensor harness back there just to replace the one ground connector can I use an independent ground?

For instance I have 5ft of 6gauge wire with ring terminals on each end, would I be able to ground this to one of the diff bolts and then back to the chassis interior under the seat (like how the OEM connector grounds) to ground the diff and eliminate the light?

Or would I need to wire it into the diff harness temp sensor somehow?
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Old 05-23-2020, 01:07 PM   #2
Cougar4
Scooby Guru
 
Member#: 53443
Join Date: Jan 2004
Location: Anchorage, AK
Vehicle:
2001 LL Bean Outback
Winestone

Default

You sure don't need to install a wire that is large enough to run your starter motor for this repair. I suggest you just splice in a new wire the same size as the old one was using a new terminal. If you make the splice under the chassis make sure it is properly sealed so water can't get at the connection.
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