Where's the wire from the alternator to under the passenger seat battery?

[Baruch]

I am trying to find the alternator-to-battery charging wire that is currently connected to my house battery under my passenger seat.
I want to put a fuse in it before installing my solar charge controller / panel. Anyone know where it connects to the house battery circuit? There's only one thick wire attached to the positive pole of my house battery. Thanks!

 

[tinman]

Unless it's been modified by the upfitter, the cable goes from the battery to the isolator solenoid switch under the driver's seat, then from the other side of the isolator in a channel under the floor to the house battery under the passenger seat. That should be the heavy wire you see on the positive pole. When I attached a solar charge controller on mine, I installed a fuse between the controller output and the positive terminal of the house battery.

 

[Baruch]

Thanks Tinman

The heavy wire on the positive pole must also be the charging / load wire from the Airstream electrical system inverter / 12v load. Perhaps the wire from the isolator joins that wire somewhere.
Did you encounter both wires?
I think I need to pull out my two LIfeline 6v batteries to find it and figure out how the wires interact.

 

[Baruch]

Can anyone help with this?

 

[Belli]

I think I can help with this. I have a 2004 T1N Interstate.

On mine, I have two positive cables connected to my batteries, which are located aft of the TV cabinet under the bench seat.

One is connected to the chassis battery isolator located under the driver seat (see photo, center, two large terminal studs) and is activated by the D+ circuit when the engine is running. (on mine, I have a fuse #18 that runs the isolator)

The other is connected to the AC/DC converter solenoid, is located under the TV cabinet, and is activated by the "battery disconnect" use/store switch (next to the fuse panel) See photo, the converter solenoid is bottom left.

If you only have one cable connected to the battery, maybe the chassis battery is connected to the house battery side of the converter solenoid. You could remove the propane/co2 alarm or use/store switch panel to look in there.

Note that under the seat, I have installed a Echo Charger (box to the upper right) that will charge the chassis battery when on shore power.

Regarding solar, I would suggest simply connecting the charge controller directly to the batteries, via a dedicated fuse, rather than though any of the solenoids. Then you can keep the batteries charged without having the rest of the DC systems operating.

Hope this helps

Joe