I happened to have the cover off the battery area junction box yesterday and took a few pics. This picture is off a 2004 T2499. I know a while ago we had a few Sunline owners trying to trouble shoot their 12 volt electrical system. The pic’s below may be able to help someone trying to trouble shoot the newer campers if yours look like this inside.
I believe the “older” models, do not know what year but it is pre 2004, they used a fuse-able link between the battery and the TT power converter to protect the system. This was reported by other Sunliners when they had to track down why their battery would not charge.
On this 2004, they have a self resetting circuit breaker. There is also a 30 amp fuse that is in line with the TV battery via the 7 wire plug harness. So if your TT battery will not charge off the TV, this could be one spot to look for providing the 7 wire receptacle in the TV is actually hot. For the converter to the battery protection, that breaker should reset once it cools down providing there is no short still left in the system.
Also when taking this cover off, you will need to have a very fine and sharp Phillips head screw driver. If not, the larger Phillips will just sit and spin the head is so small. Plus the screw holes that are recessed deep into the cover can and do fill up with dirt, making it more of a challenge to get into this area.
I have called out the colors and paths so you can see where all the wires go to. Hopefully this helps someone in the future.
Here is the junction box on the front frame of the TT. This pic also happened to have parts of my spare 5 lb. propane tank carrier. The tank sits on the gray board and clamps with the hooks.
Inside the Box
The circuit breaker
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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