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Old 08-11-2018, 06:27 AM   #1
Junior Member
Join Date: Aug 2018
Posts: 2
DUVAC 20 amp fuse blown when starting

Hello everybody. I am a new member to this forum, which I have found on the Internet during my research into my problem. My name is Graham and I live in the UK and I own a 2002 Monaco diplomat, 38, foot. She has an 8.3 Cummins turbodiesel with the six speed Alison gearbox. I have own her 4. 1/2 years. she is a beautiful motorhome. Unfortunately, just over a year ago. She developed an electrical problem.
This is exactly what happened. One morning I started the engine, she was running like a bag of nails. Something was clearly wrong. The accelerator would not respond. So I shut the engine off. Waited a couple of minutes. Then restarted her. She was running fine, ticking over nicely. Then I noticed I lost or instrumentation. So I stop the engine. And started the investigation.

What I found.

The fuse block on top the alternator which holds two 5 amp fuses. One for the ignition and the other one for the ignition accessories. One had blown. But I do not know which circuit. It was for. I am presuming it is the ignition accessories. As she started with this fuse blown. Replaced fuse. restarted engine. All instruments now working. except for the voltmeter and the tachometer reading 15 mph.

Further investigation.

I found the 20 amp fuse blown in the DVAC (DUVAC) holder inside the battery compartment. Replaced fuse. Voltmeter now working. But when I started the engine that fuse immediately blew.

When driving the RV. The tachometer reads a constant 25 mph. And the recorded mileage has stopped. I have checked both speed sensors on the gearbox. They seem to be working. And when temporary disconnected. Makes no difference to the tachometer. Very strange.

The alternator is 160 amp Leece_Neville 4800JB. I had this reconditioned. But now when you but the fuse in the DVAC holder. Three lamps illuminate on the dash. ABS, Low air " if the air is low" and park brake. Which goes off if you release the handbrake. Very strange.

I have checked just about every relay and fuse I have spent hours on the Internet trying to find a solution but to no avail.

So if anybody has got any ideas or has experience the same problem. I would be forever in your debt. If you could share your experience with me.

In anticipation of a response. I thank you very much. Graham

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Old 08-11-2018, 06:31 AM   #2
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Fleetwood Owners Club
Ford Super Duty Owner
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Welcome to Irv2. I’ve moved your post here to get some Monoco Owner input.



Cliff,Tallulah and Buddy ( 1999-2012 )
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Old 08-11-2018, 10:46 AM   #3
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Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 39,373
Hi Graham! Welcome to IRV2! We're sure glad you joined the gang!

You lost me waaay back! Sorry!

Good luck, happy trails, and God bless!
Joe & Annette

2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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Old 08-11-2018, 03:33 PM   #4
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The tach is driven from the alternator and the tach is RPM not MPR
36 ft 98 Dynasty
98 Suzuki Sidekick Sport 4 door
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Old 08-11-2018, 06:49 PM   #5
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Thank you for pointing that out. I'd meant to say speedo. On tick over the speedo registers 15 mph. As soon as you start moving it registers 25 mph and stays there. also it does not record the mileage any more. This one is certainly turning out to be a challenge. But once again, thank you for the reply.
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