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GaryS1953's avatar
GaryS1953
Nomad
Jul 28, 2025
Solved

No 12 Volt without converter

So my recently acquired 2002 Jayco Qwest 253D fiver suddenly has absolutely no power when not connected to shore power.  Both batteries are showing 12.5 volts, so seem good, but not getting charged b...
Asking for Advice
Electric
Fifth Wheel
  • opnspaces's avatar
    opnspaces
    Jul 29, 2025

    If it was me I would take a picture of all the fuses so I know what goes where. Then pull them all out of the panel. Remove any and all screws and open up the panel so you can see the battery wires in the back. From there see if there is a hidden fuse. You should also see the larger wires that go up to the batteries. Put a meter on those wires and see if you get battery power there.

opnspaces's avatar
opnspaces
Navigator III
Jul 28, 2025

At the batteries trace the positive wire until it disappears into walls. Look for a small box (circuit breaker) with the wire going into and out of. You should get the same battery voltage on both terminals of that circuit breaker If no power out of the breaker use a screwdriver blade or a short piece of wire to allow power past the breaker as a test. 

Here's a picture of a common inexpensive breaker that many RV's use. They are available at almost any auto parts store.

 

GaryS1953's avatar
GaryS1953
Nomad
Jul 28, 2025

I think your answer is probably correct.  The problem is I’ve not found easy accesss to the wires once they leave the battery compartment.  Guess I gotta start taking things apart🙁.  Thanks!

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