Oem Dual Battery (gmt800) - gm-trucks Jun 29, 2011I pieced together the OEM dual battery kit from the dealer. The part number is 15246518. Any online dealer or local dealer can get it for you. Share this post. Link to post Share on other sites. The 3 eyelet wire in question goes from Battery to MegaFuse terminal to Solenoid. The unbooted eyelet goes to the megafuse terminal. SilveradoSierra • dual battery set up : Electrical Feb 26, 2013Is there a factory dual battery harness that can be purchased through GM? if so what is the part number? I would like to add a secondary battery because even with the alternator that comes with the snow plow package, i am still having problems with keeping up with the spot lights on for an extended period of time on my truck.
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