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Old 07-17-2021, 04:32 PM   #1
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Electrical Help Needed!

I hope one of you members with a bit more electrical experience than I can help me here.

2003 Newmar diesel on a Spartan chassis - Per my Electrical Management System (EMS) monitor, I have 120 volts on both legs of a 50 Amp input, but only one leg shows a load – varying amperage dependent on what appliance is operating, the other is blank – nothing, not even zero amps indicated. Everything worked normal while in Albuquerque.

A bit of background; driving up to Colorado Springs from Albuquerque and due to a late start, around dusk I turned on the headlights. Approximately 15 minutes later my dash lights went dark. I then realized I had also lost my running lights. Pulling over I found I had headlights (hi and lo), turn signals and brake lights. However, I did not have tail lights. This morning I realized my hot water heater was operating on propane – we are plugged into a 50 amp pedestal, which, as stated has voltage, so no 110 there either.

After checking every fuse and circuit breaker I did find one 20 amp fuse blown (front door lights), one 15 amp breaker would not reset (110 outlets). Replacement did not change the no-load condition.

Thanks for any help,

John
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Old 07-17-2021, 07:54 PM   #2
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Not much help, but sounds like you have 2 problems. One with the AC circuit and one with the 12 volt DC circuits. !2 volt DC problem is probably a loose/bad ground connection. AC problem could be shore cord plug end.
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Old 07-17-2021, 07:57 PM   #3
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Start your genset and see if your AC acts normal. Pedestal at campground could have an issue.
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Old 07-17-2021, 10:13 PM   #4
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Hi John, you've gotten some good advice and comments from RVtravelz and Roughrider.

Newmar *might* have a rough AC wiring schematic for your Dutch Star and it's worth a call to find out. We may not need it to diagnose the issue, but it's a good thing to have...

Your EMS says you're connected to a 50 amp service because it measures ~240VAC from line to line but it looks like only 1 line is receiving a load. The water heater element, the house battery charger, and *maybe* whatever is on the 20 amp breaker you can't re-set are likely on the line showing no load.

How to proceed depends on your experience and comfort working in open electrical panels, which is dangerous and potentially fatal (disclaimer now made...).

As for the chassis 12VDC system, the failure is unlikely to be related to the AC service issue. The dash lights are often on the same fuse as tail/park lights, I'm told, to indicate the loss of chassis lights. If you have a trailer lights hookup, check the outlet and wiring (a few feet of it) for insulation abrasion, corrosion, other signs of being compromised. If you had a towed connected, take a look at its interconnect wiring, too.

Try the 'generator test' suggested by RVtravelz. If you have the same symptoms, it points us in a different direction than if all your AC problems go away.

Good luck and safe travels.
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Old 07-21-2021, 07:17 PM   #5
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Blank nothing means one 50A leg is dead. Have you measured voltage at the CG receptacle across the horizontal receptacles?
tutoral: https://www.myrv.us/electric/
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