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house 12V and PD 708 issues?

Unread postby rjsdotorg on Sun Feb 11, 2018 12:18 am

Since no interior 12V is working (usually): where to look first?
120V AC lights etc are good, all chassis 12V is good (all lights etc), but normally no interior lights or function on the monitor station.

Battery compartment only has the 2 deep cycle batteries (in parallel) and cables running out.
Where is the 12V fuse box on a 71? The chassis panel in front next to the radiator shows all good fuses.

the PD 708 is under the rear bed, plugged in and humming (shore power on). There is a relay under a wood cover there that does supply the lights when I manually press it. If I leave it pressed/on and toggle the 2 breakers off on the 708, then all turns off again, so maybe whatever energizes the relay is off.
Yet to find a 12V house panel, but I'll look again.
The LED lights on the house monitor, but nothing moves the meter.
The 120V panel is in the closet above the shore power cord, and next to the Onan start toggle. Both function correctly.

I installed a new vent w/fan, but there is only 120 AC wire to the roof opening; I did see a set of other wires in the roof on the pass side, along with the 3-wire Romex.

I got the 1968 diagram someone posted, do we know how much they changed?
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rjsdotorg
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Re: house 12V and PD 708 issues?

Unread postby KB2CRK on Sun Feb 11, 2018 10:24 am

I don't know why yours has a relay or 120v lighting. on our 76 there is a fuse panel hidden behind a wood sliding panel in an upper kitchen cabinet above the monitor station. All of our lighting is 12 volts. The romex near the roof vent hole is wiring for an AC unit. Some where pre-wired for 2 AC units. That romex should run to an outlet on the ceiling near the vent and should not be hooked up. I wish I could help more but as everything on these is usually modified for personal tastes every one is unique.
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Re: house 12V and PD 708 issues?

Unread postby rjsdotorg on Sun Feb 11, 2018 11:23 am

Thanks, I'll have to look and see if I can remove the wood box near the controls.

The 3 120V lights are original to mine. I replaced the 12V bulbs with LEDs.
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Re: house 12V and PD 708 issues?

Unread postby KB2CRK on Sun Feb 11, 2018 2:09 pm

The 76 had no 110v ac lights. All the interior lights in our are led along with the park/brake/ turn signal lights. I even have leds in most of the clearance lights.
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Re: house 12V and PD 708 issues?

Unread postby rjsdotorg on Tue Feb 13, 2018 10:21 am

After what I think is an exhaustive search, I do not see any 12V panel other than the chassis one in front of the radiator.

The controls have all wires heading down, but there is nothing below.
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Re: house 12V and PD 708 issues?

Unread postby rjsdotorg on Tue Feb 13, 2018 10:23 am

Now, nothing on the controls respond, and the power switch does not light...
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Re: house 12V and PD 708 issues?

Unread postby rjsdotorg on Tue Feb 20, 2018 7:16 pm

Now, somewhat mysteriously, as long as I have the relay wedged in the on (?) position (as if the coil was energized) all 12V systems seem to work.
I'll have to track down what is supposed to energize the relay and why it is not...
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