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Old 04-03-2014, 05:19 AM   #1
Stepper86
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Join Date: Sep 2011
Location: Stockholm
Posts: 263
What is this box doing?

I bought a complete drive line out of a 2004 2500HD for my 1986 Stepside.
The electrical system from the donor truck came in a big box together with misc parts.
Im going to use a new harness for my truck so most of the stuff I will probably not use. When I went trough the parts I found this little black box togeter with the ECM. Anyone that can tell me what itīs for, and do I need it?
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The fleet:
2007 BMW 530xi M (daily driver)
1986 C-10 Stepside (project "my time")
1992 Corvette cab (summer time daily driver)
1969 Cadilac DeVille Cab ("it just need some paint")
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