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Old 09-13-2017, 03:02 PM   #1
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Combination Interior Light with Fan

My 23B has a Combination Interior Light with Fan. It was not working. What possibly will be the problem?

I checked all 15a fuses and they all looked good. What else should I check? Is this a common issue?

Please advise. Thanks.
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Old 09-14-2017, 10:48 AM   #2
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Are you referring to the bunk end light/fans with the 1/4" plug? Other possible would be the stove hood fan/light fixture.

For a bunk end fan, assume you have 2 or 3. Isolate whether the problem is in the TT or the fan unit by swapping to another outlet, and trying the other fan in the outlet not working.

If it's the bunk fan itself, they are pretty easy to take apart. A couple of screws for the lens, and a couple of more for the body. When I upgraded mine to LED, I took them all apart to clean the fans. Look for a loose connection inside.

If it is only the one outlet that is not working, then you are probably going to have to take out a multi-meter and start tracing voltage at the wires. IIRC, all the fans are on the same 12V circuit, so if the other outlets work, then there is probably a loose wire somewhere. I would start with the outlet itself. If all of the outlets are out, I would swap out the fuse on that circuit just to be sure - they don't always appear to be blown when they are.
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Old 09-15-2017, 01:22 AM   #3
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The light/fan is using the phone jack plug. I tried both and not working. Tried to replace all 15A fuses even no sign of broken, still not working. Everything else works including the stove fan.
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Old 09-15-2017, 11:20 AM   #4
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Okay, I would probably start to suspect a broken connection or wire on the circuit that feeds the fans then.

Just to confirm that both fans aren't themselves dead, I would try to see if they will light up with another power source. Personally, I would grab a 9V battery and hold it against the plug with + to tip and - to ring. Assuming it has an incandescent bulb, it should light, but dimly because it is 3V less than spec. Other possible solution is to try it in someone else's HTT if you are at a CG and aren't afraid to ask.

Assuming the fan/light lights, it's time to break out a multimeter and start testing house wiring. On our HTT, both lights are on the same circuit so I would probably start with the connection on the back of the distribution panel. is there 12v present at the binding post where the circuit attaches? If yes, is there 12v at the jack where the lights plug in? If this is a no, you've got some work cut out for you. It is possible that there is a break somewhere in the wiring along the way to the jack.

You might want to contact Jayco for a wiring diagram for your TT (you'll need your VIN so they can identify) - it will show you all the devices that share that branch circuit. I would check each one in order, the last one working is probably where the circuit is broken, check for wiring/connector problems at that device.

GLTY!
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Old 09-15-2017, 01:33 PM   #5
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Do you have a multimeter? if not I would strongly recommend buying one. You can buy a digital one for about $20.

Sounds like you already did but, 1st double check the fuses, swap out a fuse with a known good one. Sometimes they blow on the edge and you cannot visually tell. With the multimeter set to check omh's it will tell you if the fuse is blown too.

I have blown countless number of fuses early on with my combo fan units. until I figured out the issue and fixed it. I found if you insert the plug crooked, you can short out the two power connectors (+ & -), which blows the fuse. I opened the cover on the female outlet and bent the strips of metal that make contact with the plug. This has completely fixed my issue with blowing of fuses.

With a multimeter, if you pull the cover off the female outlet to check for voltage. If you have voltage there the issue probably is with the fan/light unit.

My unit did not come with the outlets, I added them. But as I recall, the circuit breaker panel, stated that both bunks should be on separate fuses. You might just have a loose wire. If so, I would disconnect the power, both the battery and the shore power, pull the converter box, which as both the circuit breakers (120V) and the fuse bloc (12V), and check the terminals/wires behind there. The terminals are known to be loose. You may have pulled the trailer enough for the wires to vibrate loose.
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Old 09-18-2017, 10:21 AM   #6
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These run on the 12 volt system so you want to check the fuses and not the circuit breakers.
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Old 09-18-2017, 12:01 PM   #7
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The 12 volt side may be ok make sure you check the ground.
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Old 09-18-2017, 09:29 PM   #8
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Quote:
Originally Posted by Jagiven View Post
Do you have a multimeter? if not I would strongly recommend buying one. You can buy a digital one for about $20.

Sounds like you already did but, 1st double check the fuses, swap out a fuse with a known good one. Sometimes they blow on the edge and you cannot visually tell. With the multimeter set to check omh's it will tell you if the fuse is blown too.

I have blown countless number of fuses early on with my combo fan units. until I figured out the issue and fixed it. I found if you insert the plug crooked, you can short out the two power connectors (+ & -), which blows the fuse. I opened the cover on the female outlet and bent the strips of metal that make contact with the plug. This has completely fixed my issue with blowing of fuses.

With a multimeter, if you pull the cover off the female outlet to check for voltage. If you have voltage there the issue probably is with the fan/light unit.

My unit did not come with the outlets, I added them. But as I recall, the circuit breaker panel, stated that both bunks should be on separate fuses. You might just have a loose wire. If so, I would disconnect the power, both the battery and the shore power, pull the converter box, which as both the circuit breakers (120V) and the fuse bloc (12V), and check the terminals/wires behind there. The terminals are known to be loose. You may have pulled the trailer enough for the wires to vibrate loose.
What do you mean "insert the plug crooked"?? It is just a simple plug it, isn't it?
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Old 09-18-2017, 09:30 PM   #9
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Quote:
Originally Posted by sirrealone View Post
These run on the 12 volt system so you want to check the fuses and not the circuit breakers.
I actually replaced all 15A fuses. But I will double check later by using the meter. Thanks.
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Old 09-20-2017, 08:58 PM   #10
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Quote:
Originally Posted by sirrealone View Post
These run on the 12 volt system so you want to check the fuses and not the circuit breakers.
I checked all the fuses with the meter, and confirmed they are all good.

I checked the current that runs at the back of the socket, it has only 6.25volt. Why is that? What would be the problem?

I also checked the socket and has no problem too.

(Sigh) Everything else works, except these light/fan. facepalm:
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