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gunworks · 06-06-2013, 09:05 PM

Just returned home from week on the East Coast in 94 Landyacht. On last day before heading home the Onan 6500 propane genset started as normal, but then produced no A/C power. Ran up to Baltimore to the Onan service center and they checked the voltage at the genset and it registered 120V. Tech indicated that the brushes may have been dirty and frozen in place and road vibration jostled them loose. Ok, so last day of trip home and same thing happened while in Walmart lot for the night. Back on the road and started up the genset and now have 120v power. Finally pulled in the drive today and after shutting down, plugged in the power cord to 30A power box and no 120 V in the coach. No breakers tripped, and the 30A box has the voltage. I'm thinking the Time delay bypass module has failed or partially failed as I can get 120v from the genset sometimes and shore 120v not at all. I pulled the module and it looks like this:

Now what? Where can I get a new one, and is this an Airstream supplied part, or something supplied after market. Onan service people won't work on this as it is not part of the genset.. By the way it is located on the road side beside the bed at rear. Any suggestions?

richinny · 06-06-2013, 10:59 PM

there should be a wat to test/bypass it. if it is bad, a place that actually repairs tv's and such should be able to repair it if it is obsolete. one of our boards electronic guru's should be able to help more than i can.

92landyacht · 06-07-2013, 07:21 AM

It's hard to tell from the picture, but is the board covered with an wet oily substance or is it hard and dry? If it's wet, I clean the board with some contact cleaner. Are all four of the diodes (4 black with silver lined components on the left hand side) intact? The second one looks like it may have a chip out of it. Could just be the way the picture looks.

With that said, I don't believe the problem is with the board. I'd be more suspicious of a relay contact/switching issue in the transfer switch. The delay board only effects genset switchover and should not have caused 0v on both shore and genset power. I'd find the transfer switches and start troubleshooting there.

gunworks · 06-07-2013, 08:11 PM

The board is dry and all resistors are intact. The shine is just whatever was sprayed on it as a sealer. As for the transfer switches, where do I look? Are these in the same box as the bypass? Page H-31 in the manual just calls the box a power switch electrical box and the wiring diagram for the 50 amp service shows a junction box at 'W' called an automatic switchover relay. I can do most mechanical things, but electrical eludes me. I have tested continuity on all the board connections with a meter and they seem to be good, but that is about all I know to do. Oh, and the genset is '94 not the LY.

92landyacht · 06-08-2013, 06:18 AM

Quote:

Originally Posted by gunworks

Oh, and the genset is '94 not the LY.

Exactly what do you mean by this?

As for where the transfer switch is and how to verify it, in your case I'd seek out someone a little more electrical savvy and give AS a call and see if they can point you in a direction on where to find it.