Serious electrical problems 93 excella

[Toenail]

Hey gang i'm new to the A/S world so take it easy...big problems w/1993 excella 30ft...i can take all the elec. breakers out and still have SOME elec. power to plug ins...not all have power...maybe half have power...everything seems normal....microwave is the only thing that doesn't work...my electrician buddy is stumped....

[SteveH]

Welcome to the forum, Toenail. If you are talking strictly about the AC power system, and all the breakers are either off, or as you say, "out", there must be some non-standard wiring in your trailer. Maybe a previous owner wired some of the circuits around the breakers?

[Toenail]

Tks. Steve...yes the ac power....we physically removed all three of the breakers out of the box and it still had 110 power to some of the plug in recepticals...very strange....it doesn't appear to be any kind of alterations to the wiring that we can see....#1 breaker is supposed to be the main breaker, but when we removed #1 breaker the remaining 2 breakers still had power going to them?????....could of been a large problem if we hadn't of made the discover. my elec. buddy is supposed to be asking around for help....

[Mike Leary]

Originally Posted by Toenail

.microwave is the only thing that doesn't work...my electrician buddy is stumped....

Not sure about your coach, but ours has a switch under the sink so we can run microwave OR roof air. The system will not run both at once. Just a thought.

[Jammer]

How is the trailer connected to power? Through the shore power cable? Has the shore power connection been modified?

[kennethowens]

Suggested start point:

The cord providing "shore power" - trace it coming into the trailer
and to the breakers.....

[Toenail]

It is connected to power by the power cord....we have already checked out the power cord and it is good.... the cord comes in the left rear of the trailer and goes into a junction box inside by the left side of the bed...then it goes up out of sight which we assume to the electrical box where the breakers are located in the rear above the bed...yes i already found the micro/ac switch.....i haven't taken it apart yet....maybe today...gang thanks for the help.....this one has got me fooled so far....i'm thinking lightning problems or something like that...i'm not good at electrical stuff, but i've got good friends that are...tks again

[kennethowens]

Unplug first-

Take the junction box apart....you must know what
is there and where it is going.

You want ONE unbroken cable from shore power to the
breaker - no exceptions

[Toenail]

my elec. buddy took it apart and only found a loose ground wire....i will have to talk again with him to verify what it looked like....he didn't find anything unusual inside the junction box....tks

[DKB_SATX]

If the sub breakers were still hot after you physically removed the main, perhaps somewhere an outlet or switch was wired directly off the incoming shore power before the breaker box and was left connected to the rest of its original circuit... feeding power back to the sub breakers through that original circuit.

Could it also be some sort of variation of the "hot skin" problem, where a leg is transposed somewhere in the system and feeding back through the neutral? I haven't thought that through to see if it makes sense for all the conditions reported, but it occurred to me as I was writing the first paragraph.

[reo]

I'm not really into electronics but....Have you tried disconnecting the batteries and then checking? Maybe there is an inverter putting AC in the system.

[Toenail]

Guy i really would like to thank everyone for the suggestions...some of this stuff is over my head.....i'm good at hot rods/muscle cars....not this....i'll have to let my elec. friends read these threads and they will know...there is not any problems with anything 12 volt so we assume it would not be the converter....tks again