Re: [A/S] Digest Number 2215

[chasgould@xxxxxxx]

Okay, I can help you on this one. There are all sorts of things that this  
might be, but my experience is that the Univolts are actually very good units  
and quite bulletproof. They are often blamed for other faults.
Usually there is a problem with a breaker or fuse which feeds the Univolt,  
or maybe your 110 outlet at the house. Do you have 110 power to the  Motorhome, 
like the air conditioner, and AC fridge? If so, then check the  circuit 
breaker (main) and also the separate one that feeds the Univolt. The  Univolt also 
plugs into an outlet, and if you store stuff in that area, the plug  can come 
out of the wall outlet, or another appliance on this circuit could have  
tripped a breaker, either in the motorhome or in the land line power source.  There 
are also fuses in the Univolt box itself. Check these as well.
A very common problem is that the large fuse holders in the front  engine 
compartment (two of them, one for Positive and one for negative from  the engine 
and coach batteries) become corroded and anodized, and the fuse  will appear 
to be fine, but the ends are not making contact with the fuse holder  brackets. 
But this problem usually interrupts all 12 volt power but still  allows the 
Univolt to hum, so I suspect that this is not your problem. It is  most likely 
a circuit breaker or land line problem. You may try to find the plug  for the 
Univolt and plug it directly into an outside extension cord from a land  line 
power outlet and see if it hums.
If the Univolt has failed, they are only $200 to $250 and easily replaced,  
or there are many alternatives to the original Univolt unit.
Chas