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Old 07-01-2019, 07:46 PM   #1
4 Rivet Member
2016 Interstate Grand Tour Ext
Houston , Texas
Join Date: Oct 2015
Posts: 333
Loss of House Power Mystery

OK, here is one for the trouble shooting crowd. I'm stumped.


All is well into a 2000 mile journey. Pull into a rest area to have a casual lunch. Go to start the Generator and loose all house power. Turn main off and on and nothing. Manually operate the manual disconnect on and off and then the house main. Power restores, but house showing 12.4 volts. NOTE: had 30 Amp shore the night before. Try generator again and it starts, but voltage pulled down low enough the Kenwood reboots. Have lunch, drive home and started genset twice and had no issues.

Suspected house batteries (going on 4 years old). Turned off Solar Charge. Charged with shore power overnight and then let house sit with main off and no shore power for 4 hours. Batteries held steady. Disconnected the 4 batteries and measured OCV. All over 12.9V. Checked battery fuses (I have three) and all pass continuity test. Checked torque of all connections including Genset. Reconnected and started Genset. No issues. Started van and BIM operated (or at least I noted 13.1 Volts on the House) All good.

I'm at a loss. The only thing different than normal is we drop through a torrential storm the evening before.
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Old 07-01-2019, 08:31 PM   #2
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2004 22' Interstate
Tipton , Iowa
Join Date: Mar 2003
Posts: 4,497
Images: 37
I am NOT an auto-electrician. I didn't even stay in a Holiday Inn Express last night, so take my thoughts with that in mind. I always start trouble-shooting the low hanging fruit. If I pick it and the problem is resolved, then all's good.

I've had something similar occur after a torrential rain with significant humidity for some period of time and cleaning the battery terminals and posts seemed to have solved the intermittent issues I was experiencing that were similar to what you've described.

I have no logical reason that worked other than perhaps the battery terminals were just corroded enough that the extra moisture involved sent them over the edge, resistance-wise, and they were fine after they dried out. I really don't know enough to postulate any further. But cleaning the terminals and battery posts took care of my issues.

If that works for you, then I'm a genius and you can congratulate me. If, OTOH, you clean the posts and terminals and it makes no difference, then just pretend I never posted.
AIR 2053 Current: 2004 Airstream Interstate "B-Van" T1N Sprinter & 2006 Born Free 32 RQ Kodiak Chassis
Former Airstreams: 1953 Flying Cloud, 1957 Overlander, 1961 Bambi, 1970 Safari Special, 1978 Argosy Minuet, 1985 325 Moho, 1994 Limited 34' Two-door, 1994 B190 "B-Van"
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Old 07-02-2019, 06:08 AM   #3
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2007 Interstate
League City , Texas
Join Date: Oct 2014
Posts: 5,607
Is it possible that T1N and NCV3 Interstates have similar designs with respect to electrical hardware, one problematic circuit breaker in particular?

Because back when we had our OEM electrical system, intermittent house power loss was one of our signature problems.

Pick up my husband's "lithium battery adventures" thread here at post #384, and evaluate whether there could be any similarities to your situation. That's where he describes that particular problem.
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Old 07-02-2019, 09:23 PM   #4
4 Rivet Member
2016 Interstate Grand Tour Ext
Houston , Texas
Join Date: Oct 2015
Posts: 333
Thank you 85H325 and InterBlog. I never thought to consider the CB between the House Batteries, BIM and House Disconnect, but that could explain the symptom. Will have to check that. It is a minor pain to get to so I may wait to see if it happens again.
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