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Old 04-29-2015, 02:41 PM   #1
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No power when using battery

Hi!

I have an older (1998) 2108 TT I recently purchased used, and while I love the camper I'm having issues using the battery alone for 12vpower. When the trailer is connected to 110 shore power everything works fine- lights, fridge, AC, etc., but when using only the battery there's no power at all. I've replaced both the battery and the 12v30A circuit breaker located on the A-frame, but with no success in resolving the issue. Lights do not power on, and the battery indicator inside the camper shows nothing at all.

Fuses and breakers all test OK when hooked to 110, but while on battery only I checked the battery cable connection at the converter with a multimeter shows 0V, indicating that no power is coming from upstream- does anyone have experience with this particular issue? Am I missing a battery bypass/kill switch somewhere, or perhaps there's a connection under the cabinetry that could have become loose?

One other thought: the 7 way cable was replaced by the previous owner a few years ago after an unfortunate incident, looking in the junction box under the trailer it appears all the wiring is co-mingled together via wire caps. Is it possible that the service tech created an open circuit by wiring everything together improperly? Previous owner never used the battery power so there's no way to confirm if this issue is new, unfortunately.

All advice is appreciated!
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Old 04-29-2015, 02:47 PM   #2
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Pull the cover off your distribution center and check for 12v there from the battery .
If not you need to work your way to the battery.

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
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Old 04-29-2015, 02:55 PM   #3
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Pull the cover off your distribution center and check for 12v there from the battery .
If not you need to work your way to the battery.

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
Thanks!

I've done that, 0V on the multimeter. I'm hesitant to go wire by wire back to the battery for fear of messing something up even worse. I'm hoping there's a common failure point that I can focus on before getting that far
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Old 04-29-2015, 02:56 PM   #4
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After installing circuit breaker do you have power on the non battery cable side?

Is it possible the previous owner installed a battery disconnect switch?

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
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Old 04-29-2015, 03:19 PM   #5
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After installing circuit breaker do you have power on the non battery cable side?

Is it possible the previous owner installed a battery disconnect switch?

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
No disconnect switch that he knew of (fortunately I was able to contact him). He had never even used the battery,

The breaker reads 12.7V on the "BAT" post, same as at the battery itself, but ~0.9V on the "AUX" post. Should I bypass the circuit breaker and test the system that way, or do I risk damage elsewhere if there's a bigger problem?

I tested the circuit breaker with the ohmmeter and it showed continuity, which just confused me even more.
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Old 04-29-2015, 03:32 PM   #6
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Did you test continuity with cables disconnected? Disconnect from the battery and shore power while dinking with these cables. The current potential is huge.
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Old 04-29-2015, 03:32 PM   #7
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Try hooking up direct once.
Bypassing curcuit breaker.

TURBS
08 duramax tuned n modded, 32bhok Sabre
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Old 04-29-2015, 03:46 PM   #8
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Did you test continuity with cables disconnected? Disconnect from the battery and shore power while dinking with these cables. The current potential is huge.
yes- I'm not connected to shore power at all, and tested the c/b continuity before installing.

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Try hooking up direct once.
Bypassing curcuit breaker.

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
Thanks. Is it safe to connect directly at the converter inside, or should I connect at the ring terminal that connects the c/b and goes into the trailer?
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Old 04-29-2015, 03:56 PM   #9
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yes- I'm not connected to shore power at all, and tested the c/b continuity before installing.

Thanks. Is it safe to connect directly at the converter inside, or should I connect at the ring terminal that connects the c/b and goes into the trailer?
Turbs is saying temporarily bypass the C/B. You could simply move or connect the lead going to the converter to the Batt side of the C/B along with the cable going to the battery. Connect back to the battery and see if you have a interior light.

Or if all is connected, strap across the two terminals of the C/B.
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Old 04-29-2015, 03:58 PM   #10
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Turbs is saying temporarily bypass the C/B. You could simply move or connect the lead going to the converter to the Batt side of the C/B along with the cable going to the battery. Connect back to the battery and see if you have a interior light.

Or if all is connected, strap across the two terminals of the C/B.
Correct.

TURBS
08 duramax tuned n modded, 32bhok Sabre
2015 camping "2 nights"
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