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Old 09-30-2020, 04:40 PM   #1
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Genset Start Switch, or *Really* Cheap AGS...

When we woke up this morning (at home), the generator was running in the coach. This is sort of unusual, to say the least. We were plugged in, and the rig doesn't have an autostart system, but start on its own it apparently had. I traipsed outside in by slippers and robe to shut it off.

An hour or two later, it started up again! I shut it off again. Then I turned off the coach battery disconnect, and the instant I did, it started again. This turned out to be coincidence, I found later. I turned the battery back on and the gensert back off. Then I tried to turn it on, and it wouldn't crank. I pulled the genset out and pushed its start button and it fired right up. I turned it off and ran the slide back in. A minute or two later, it turned over, perhaps once, and went silent. A few minutes later, the same thing. I tried the remote start panel in the bedroom and it also did not work. Hmmmm...

Finally, I unplugged the center lead from the dash's genset start switch. Everything now works normally except that switch. New one on order...but I thought I'd share.
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Old 09-30-2020, 04:42 PM   #2
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There have been reported instances of "ghost" starts and it's usually caused by corroded connections in the generator bay. The connection from the dash start switch is probably the culprit since disabling that stopped the problem.
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Old 09-30-2020, 06:44 PM   #3
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had a buddy in high school who kept finding his car running in the driveway when he got up in the morning. one day the gas tank was empty. because it only happened at night in his driveway he stayed up one night watching and listening sure that someone was playing a prank. after a few hours he heard the car start and looked out the window but saw no one. AFAIR he "solved" the problem by selling the car.
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Old 09-30-2020, 07:10 PM   #4
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Quote:
Originally Posted by Lt Dan View Post
There have been reported instances of "ghost" starts and it's usually caused by corroded connections in the generator bay. The connection from the dash start switch is probably the culprit since disabling that stopped the problem.
Thanks. I'll check the harness connections tomorrow on what the book says is connector J8/P8 and report back. That would have been my next step if disconnecting the switch hadn't worked, and I've been meaning to do it anyway after reading various gremlins caused by corrosion of the connections to these gensets.

However, I think the same harness is used for the both the BR and dash switches. The connections are daisy-chained between the two. There are two wires on each connector at the dash switch. With the dash remote switch disconnected at the dashboard switch itself (that is, not at the genset), it's been OK most of the day now, and the BR switch and indicator now work correctly, which they did not early this morning.

On the other hand, we could wake up tomorrow and find it on again (grin). Either way, I'll check out those connections. Checking is free...3/4 tank of diesel--100 gallons!--if we're away and this happens again isn't!
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Old 10-01-2020, 09:43 AM   #5
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The genset stayed off all night, so it's been over 24 hours now without a spurious start. I pulled J8/P8 and found no corrosion. I sprayed it with cleaner and worked it in and out several times anyway. Then I dug more into the wiring diagrams. I found that the start/stop switch on the generator itself is not on the same circuit as the remote start switches. Instead, both plug into the inverter board on different pins of P2.

Has anyone found corroded connections inside the genset itself at the inverter board?
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Old 10-12-2020, 06:05 PM   #6
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New switch arrived this morning. I put it in. No ghost starts so far...
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