I am installing a charge/discharge meter on my truck and am trying to figure out what the third wire that comes off of the battery is going to. One wire goes to the starter, one goes to the fuse box for accessories, and then this one goes in to the cab and starts to go behind the driver's seat. It is about 6 or 8 gauge so I feel like it could be kind of important. It doesn't power the seat adjustments by the way, already checked. Maybe powers the fuel pump? Please give me some ideas as to what this could be. If you'd like to see a picture, send me your email/phone number and I'll send one.
