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Old 10-07-2023, 06:09 PM   #1
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Brand: Thor Motor Coach
Model: 33SW
State: Florida
Posts: 14
THOR #30854
12v charge line in trailer harness for toad

I have a Thor 33SW SuperC and while setting it up to tow my Bronco I have realized that the charge line in the 7 way trailer connector is not live. Has anyone successfully taken the harness apart and made that work? I'll be investigating soon but just thought I would check to see if anyone already tackled this and had some tips. Thanks!

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Old 10-07-2023, 06:32 PM   #2
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,295
THOR #7035
Did you install the 30 amp fuse for that line in the chassis fuse box?
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Old 10-07-2023, 06:56 PM   #3
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Brand: Thor Motor Coach
Model: 33SW
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THOR #30854
Thanks for the reply! I have not checked for the fuse yet but after reading some other forums some claim that the truck needs to "sense" a trailer (toad) connected before it will send power to that circuit, and potentially you have to apply the brakes at least once before that happens. So I need to go plug in my toad and test this theory and then check the fuse if I don't have immediate success.
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Old 10-07-2023, 07:36 PM   #4
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THOR #7035
Quote:
Originally Posted by willettj View Post
Thanks for the reply! I have not checked for the fuse yet but after reading some other forums some claim that the truck needs to "sense" a trailer (toad) connected before it will send power to that circuit, and potentially you have to apply the brakes at least once before that happens. So I need to go plug in my toad and test this theory and then check the fuse if I don't have immediate success.
You're talking about a charge line, not a brake controller - no "sense" required. But the chassis supply fuse is not installed from the factory in most vehicles.
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Old 10-11-2023, 01:52 PM   #5
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Brand: Thor Motor Coach
Model: 33SW
State: Florida
Posts: 14
THOR #30854
Correct, the brake controller does not apply here. I did verify for my F-550 chassis the tow charge circuit is at position 90 in the fuse box under the hood and the 25 amp fuse is installed and I tested the fuse and it is good. Apparently my next step is to attempt to trace the circuit back from the 7-way and see where the problem is or just tie in a new relay etc to one of my upfitter switches to work it.
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