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2005 suburban 2500 dual battery

happy 3345

New Member
Joined
Dec 31, 2019
Messages
8
i have 2005 suburban 2500 6.0 i have the plug near the pass side of the for the relay for dual battery.i checked the plug and found has no voltage whatso ever.i've read you have to do something under the fuse block under the hood to get to work i want to use the tp2 option for dual battery setup im pretty good at wiring.i traced the wire back with ton generator.can someone help?
 
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