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Old 06-15-2013, 05:48 PM   #1
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Electrical problems '98 Newmar on a GM workhorse chassis

I have a 1998 Newmar Mountain Aire 38' on a GM workhorse Chassis. On my way home from a trip, I lost power to the driver side power window, mirrors, backup camera, overhead front window blower, etc.. Now the starter has stopped working. 8.lL. Gas. All fuses seem to be OK, battery is fully charged 13.6v. I have checked as many grounds as I can find and the power is holding up in the 13v. across all connections. Any suggestions. I would take it to a Newmar dealer if I had one close by AND could get it started.
Thanks for any suggestions

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Old 06-15-2013, 05:53 PM   #2
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Hi and welcome to the forum.

Sorry to hear of your troubles. It sounds like you're plugged in to shore power if you're reading >13v across your house batteries(?).

When you say the starter has quit working, does it click or make any sound at all? Have you been able to check voltage at the starter solenoid?


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Old 06-15-2013, 06:03 PM   #3
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electrical problem

Yes, I am on shore power. Also the chassis battery is showing 13v.+ All batteries appear to be fully charged.

When engaging the starter there is a slight HMMMMing sound. No clicking or other sounds.

No I have not been able to check voltage at starter.

If I push on the K5 starter relay(in the dash) I can get a connection for the window etc. butno starter.
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Old 06-15-2013, 06:15 PM   #4
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Maybe remove shore power so no battery charging occurring and clerk voltages again. No starter plus other outages that are likely chassis 12v system items seems battery is likely. If you use the boost switch to tie the house batteries to the chassis battery is there any joy?
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Old 06-15-2013, 06:29 PM   #5
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electrical problem

No change in voltage readings with shore power disconnected. 12v. chassis battery is reading 13+v.

Boost switch has no effect.
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Old 06-16-2013, 12:12 AM   #6
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Might check the positive battery cable. If you have two to the start battery corrosion may have set in. There also may be some fusible links comming of the starter.
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Old 06-16-2013, 07:52 AM   #7
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Welcome to irv2.
It sound like you have all the battery you need but with the other important side missing ground, you need to check all the ground wires to your chassis frame, some CABLE CONNECTION is loose or dirty.
It could also be a loose ground wire to fuse buss common to all your different circuits not working.
A hum maybe a solenoid on your fire wall may have high resistance connection or dirty connection or defective solenoid & could also be starter solenoid.
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Old 06-16-2013, 07:56 AM   #8
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If you are getting a hum when trying to start, it is the starter. If you have a helper, tap on the starter while someone turns the key. As to the other stuff, can't help you, sorry.
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Old 06-16-2013, 08:54 AM   #9
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It could be in your "Battery Control Center" BCC , You have 2 big red wires attached to the battery positive terminal, one goes to the starter, the other one goes to your BCC trace the second red wire to the BCC. It should lead you to an area or black box with fuses and relays, it could be a bad relay.
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Old 06-16-2013, 03:53 PM   #10
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electrical problem

Well I had my helper inside working the ignition as was suggested. She then said, "You know this is in reverse?" OK starter problem solved. I guess the lock out works and gives off a slight humming sound. Well that was embarrassing!!

Now for the rest of the problem. I have cleaned every ground I can find, double checked with volt meter, Voltage is holding in the 13v range on both sides of all ground connections. I am now convinced it is in the electronics in the dash. Most of which I do not have a clue about. OFF TO A NEWMAR DEALER IT GOES!!



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