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07-23-2012, 05:57 PM
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#1
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Member
Join Date: Jan 2012
Location: Virginia
Posts: 38
SUN #3292
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Tow Vehicle not Charging Camper battery
When connected to the tow vehicle the battery does not charge. Vehicle side has 12v.
Even when battery on camper has 12v the black wire on the camper connection does not show voltage.
Any ideas on where to start?
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02 Sunline T320SR
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07-23-2012, 07:14 PM
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#2
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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There is a junction box on the header of the trailer. It is where the 7-way plug wire enters. Here's an exploded pic by JohnB:
My bet is that the 30AMP fuse might be blown.
JohnB posted an excellent 12v troubleshooting thread HERE.. That's where I found the pic...
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07-23-2012, 09:07 PM
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#3
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Moderator
Join Date: Dec 2006
Location: Michigan
Posts: 6,156
SUN #123
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Your tow vehicle will probably have a trailer battery charge fuse in the fuse box. While I agree with Gary that that's probably your problem, it might be a good idea just to check that fuse to make sure it's good too.
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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07-24-2012, 02:44 AM
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#4
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Member
Join Date: Jan 2012
Location: Virginia
Posts: 38
SUN #3292
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Thanks for the posts. Very good picture for identification of what wire is what. Unfortunately my 02 T320SR doesn't have a nice electrical box like that with the fuse there for easy access. I'll have to follow the 12v black to where the fuse is on the trailer to find it I guess. I am betting it is in the little box under the bed and under all the beach toys, chairs, fishing gear...  I'll let you know what I find later tonight.
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02 Sunline T320SR
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07-24-2012, 04:54 AM
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#5
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Senior Member
Join Date: Jan 2011
Location: Florida
Posts: 1,279
SUN #1830
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It will be the last place you look for it. Look there first. 
Good luck!
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Beverly & Jim
Sebring, Florida
1991 T-2363 Solaris
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07-24-2012, 02:23 PM
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#6
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Moderator
Join Date: Dec 2006
Location: Michigan
Posts: 6,156
SUN #123
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Then the box is probably either right behind that header panel underneath the trailer, or it's in the front inside, underneath the bed hidden in a little wood box. If it's the wood box, it would say "Vehicle Fused Link Inside", or something like that. Follow the wires from the 7 way plug and you'll find a junction box eventually.
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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07-24-2012, 03:27 PM
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#7
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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I should have remembered that the 320 had the wooden box! D'oh!
We had one of them too...
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07-31-2012, 12:30 AM
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#8
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Member
Join Date: Apr 2012
Location: Pennsylvania
Posts: 85
SUN #3575
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Out of curiosity; what size fuse do you have in the tv to the trailer battery? I'm installing that line tomorrow myself and would like to know a good cut off point?
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07-31-2012, 04:25 PM
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#9
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Moderator Emeritus
Join Date: Jul 2009
Location: South Carolina
Posts: 2,040
SUN #897
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Quote:
Originally Posted by musikaldave
out of curiosity; what size fuse do you have in the tv to the trailer battery? I'm installing that line tomorrow myself and would like to know a good cut off point?
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30amps.....
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