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No power from Battery

Navy_E-8
Explorer
Explorer
1st post - 1st question. 2nd trip with newest tt. I have power to both 120 and 12v systems when plugged into shore power or connected to the truck but it must be running. I have no power when just connected to battery. Battery is tested good. No blown fuses that I can find. Any suggestions
14 REPLIES 14

Navy_E-8
Explorer
Explorer
I know that now... thanks....

beemerphile1
Explorer
Explorer
rrupert wrote:
Navy E-8 wrote:
...Even though I checked the 30 amp inline fuse and thought it was good - it was not. Replaced the fuse and now everything works....


This is a common error. You may have visually checked the fuse and it looked okay....


True, the only way to check a fuse is to test for continuity.
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rrupert
Explorer
Explorer
Navy E-8 wrote:
To everyone who responded - Thank you very much. The problem was solved. Even though I checked the 30 amp inline fuse and thought it was good - it was not. Replaced the fuse and now everything works. Thanks again....


This is a common error. You may have visually checked the fuse and it looked okay, many times fuses are burned through on a spot that is out of view. If you don't have a multimeter get one, it can be very useful for many things.
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Navy_E-8
Explorer
Explorer
To everyone who responded - Thank you very much. The problem was solved. Even though I checked the 30 amp inline fuse and thought it was good - it was not. Replaced the fuse and now everything works. Thanks again....

2112
Explorer II
Explorer II
My 30A resettable breaker located on the trailer frame failed and didn't reset. Same symptoms as yours.

If you are intimidated by a multimeter, a 12V circuit tester such as THIS will find your problem. You can buy them at any auto parts store and most big box stores. But I do highly recommend any camper owner to invest in a multimeter.

With the camper unplugged, if the tester lights on one side of the circuit breaker but not the other side, the breaker has failed. If it lights on both sides, the problem is downstream away from the battery. If neither side lights, the problem is towards the battery.
Make sure you are using a known good ground if the tester can't reach the battery negative post.
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Old-Biscuit
Explorer
Explorer
Unplug trailer from AC Power Source and Truck umbilical cord

Measure DC Voltage on BOTH sides of the 'DC Circuit Breaker' (tin can with dual studs)

DC on battery side but not on trailer side....replace the DC Circuit Breaker
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Navy_E-8
Explorer
Explorer
Navy, in your original post, are you saying that you get 12vdc in the trailer if it is plugged in? Your 12v stuff works? Then when you disconnect 120, the 12vdc goes away?


Yes. That is correct. Everything works fine while I have shore power hooked up or if I am connected to the truck and it has to be running otherwise the 12v stuff does not work. There are no blown fuses that I can find and there are no battery cutoff switches and there are no reset switches that I can find between the battery and trailer.....

mike-s
Explorer
Explorer
Before anything else, get a multimeter. Even a $5 or free with purchase Harbor Freight one. Otherwise, you're flying blind. You need o be able to measure things.

groundhogy
Explorer
Explorer
Navy, in your original post, are you saying that you get 12vdc in the trailer if it is plugged in? Your 12v stuff works? Then when you disconnect 120, the 12vdc goes away?

westend
Explorer
Explorer
Navy E-8 wrote:
I saw that on you-tube and on here also. I am not saying there is not a reset button but I could not find it. I have two sets of a two prong device with wires going to them. Was told that a tiny reset button was on one going to the trailer. I did not dis-connect the wires - Is that necessary to set the reset button???
No, it's not necessary but, if there is a fault, it will immediately open the circuit breaker. Worth a try at resetting.

These little "tin can" circuit breakers are cheap, can be found at auto parts stores, and are easy to replace, should that be necessary. They will be marked with the value for amperage.
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Navy_E-8
Explorer
Explorer
I saw that on you-tube and on here also. I am not saying there is not a reset button but I could not find it. I have two sets of a two prong device with wires going to them. Was told that a tiny reset button was on one going to the trailer. I did not dis-connect the wires - Is that necessary to set the reset button???

starlord
Explorer
Explorer
Follow the red wire from the battery, it usually connects under the trailer to a circuit breaker. There should be a button to reset it.

Navy_E-8
Explorer
Explorer
No battery cutoff switch anywhere. If there is I cannot find it.

downtheroad
Explorer
Explorer
Battery cut off switch somewhere?

Anyway, welcome to the Forum...members with much more knowledgeable than me will certainly solve this one for you....
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