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Old 10-21-2012, 12:24 PM   #1
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1997 30' Excella
1983 31' Airstream310
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Generator Switch-over relays

there are two in 345's. This is the problem I have:
Sometimes, after shutting down the generator, the rear relay does not complete the circuit to connect me back to shore power. If i restart the generator and shut it down, it usually fixes the problem. Today, while running the rear A/C the power shut off. I checked the 30 amp feed to the RV and it was good. I checked all the breakers and they were good, but still no 110V. So I started the Generator, which gave me power back on all circuits. Once I shut the generator down, power was back from the the 30 amp shore line.
All I can figure is that I have some bad points or a defective Electro-magnet in my relay box.
Any thoughts on this issue?
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Old 10-21-2012, 12:38 PM   #2
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1974 Argosy 20
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Yes, you most likely have a relay with bad contacts in the transfer switch box. On my 310, when I had it, the transfer box was in a very difficult location to service. Mine would not pull in when the generator was running. Hard to get at to service and replace.

If yours is in a reasonable location, and you can get it out, you might take a point file (from the old days of ignition points) and dress the contacts on the relay. That will probably solve the problem, at least for a while. If it is difficult to get at it, I would recommend just replacing the whole thing and hoping it lasts another 25 years. Sometimes items like that can be fixed for a short time, but are so hard to get at, a replacement is a wiser choice.
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Old 10-21-2012, 12:53 PM   #3
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Peter, I agree with Idroba that it's time to replace the transfer box. The last thing you want to have happen is for one (or both) of those relays to fail in the wrong state where both generator power and shore power are potentially shorted together.

THAT would not be a pretty sight.

Brad
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Old 10-21-2012, 01:50 PM   #4
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Thanks for the feedback, but I thought you would say: No worries, it will fix itself by tomorrow .
This may explain the voltage drop I have when comparing it at the House plug and inside the RV ~3V
I found the box after pulling out a big drawer under the rear double bed, not anywhere close to where the owners manual says it should be.
Now looking for a replacement ..TS-30 Todd Engineering..I am wondering if I just can replace the relay
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Old 10-21-2012, 02:06 PM   #5
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I wish I could tell you no worries but when it comes to isolating two different power sources I always worry

This one doesn't look to bad for $60 - PMTS-30.
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Old 10-21-2012, 02:52 PM   #6
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Thanks Brad!
Cleaned up the points on both boxes and yes they were not smooth and pretty. Now have same voltage inside the RV as at the 30 amp plug.
On shore power (dedicated 30 amps) i get 120 V without A/C and 113 V with 1 A/C running and the 1000 watt converter.
The Honda EV6010 gives me 123 volts without load and 119 V with both A/C's running at High Speed and the converter.
The 4 volt drop on the Honda is to be expected, but is the 7 volt drop on shore power normal?
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Old 10-21-2012, 03:08 PM   #7
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Quote:
Originally Posted by PeterH-87MH View Post
Thanks Brad!
Cleaned up the points on both boxes and yes they were not smooth and pretty. Now have same voltage inside the RV as at the 30 amp plug.
On shore power (dedicated 30 amps) i get 120 V without A/C and 113 V with 1 A/C running and the 1000 watt converter.
The Honda EV6010 gives me 123 volts without load and 119 V with both A/C's running at High Speed and the converter.
The 4 volt drop on the Honda is to be expected, but is the 7 volt drop on shore power normal?
Well that's good news.

We are at about 113 vac when the a/c is running on our 310 so I don't think your numbers are to far off the mark. You have roughly 25' to 30' of 10 gauge power cord which will cause a voltage drop. If the outlet you're plugged into for shore power is a long run from your breaker panel or undersized wiring that could exacerbate the voltage drop problem.

You might take a voltage reading where you plug into shore power to see what the voltage reading is there. That should give you an indication as to where the drop is coming from.

Brad
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