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i am missing two relays under the hood next to fuse box. i have two that are sideways, but the box that is long ways, the relays are missing. i hope one of those are for the trailer battery charge system. any ideas what these are for? thanks mike
 

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I was looking at that yesterday to. More then likely your missing the fuses for the trailer. Look in the fuse block under the hood at the maxi fuses should be the 28. also in the book 39 is the relay for the tow charge. Maybe some one can help out and tell what those relay next to the fuse block gos to
 

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#s 38 and 39 in the manual. 38 is the backup relay. 39 is the charge relay.
It took me forever to figure out that's what they were. But that is them.

Then of course you have your other fuses for turn lights and running lights and such in the batt junc box next to it.
 

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Idk either haha. Just put in a relay for both and you'll have reverse lights AND 12V charge line.
Or just hook one up, if the wrong thing works, switch it.
 

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