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Old 08-31-2017, 07:06 PM   #1
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Join Date: Oct 2015
Location: Cumming GA
Posts: 5
Alternator Failure Audible Warning

I'm having an ongoing problem in my 1992 Affinity. I am unable to run my generator and chassis engine simultaneously, without getting an audible "alternator charge failure" warning. It has nothing to do with the alternator, as that has been checked numerous times. I can run each engine separately with no problem, the warning only occurs when both engines are running (or if running the chassis engine while plugged into shore power).

My mechanic thinks that whoever removed the Hart converter (which came stock with the unit) and replaced it with the modern combi unit that was in it when I purchased the coach must have re-wired something incorrectly, thereby causing the problem above.

Has anyone experienced this problems, and if so...what was the solution?

Any help you can give would be appreciated!

Fred Roeck

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Old 08-31-2017, 07:30 PM   #2
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Join Date: Jul 2014
Posts: 20,133
Your MH probably wasn't built with a way for the house system to charge the chassis battery.

I'll bet that now it does.

The charging voltage from the house system will fool the chassis charging system to believe it's not charging and sound the alarm.

See if your boost solenoid is activating when either system is charging. That will join the battery banks. You could disable that and use a Trik- L - Start.

They may have installed a B.I.R.D. system. Bi-directional Isolation Relay with Delay. If you find one of them, Google it for how it works. It will have a signal wire to disable it if two charging sources are present.

Send pictures of you battery control center.

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Old 09-02-2017, 12:01 PM   #3
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Join Date: May 2004
Location: Cave Creek, Arizona
Posts: 339
I believe Twinboat is correct. I will chime in that there is an isolation relay, or whatever it's called, that separates the alternator from the gen set. I don't remember exactly how it is wired but when fixing my friends Monaco i found the same type of wiring. That got my curiosity up so I looked into my coach and found basically the same. Look in your wiring schematics and you will find the circuit and it will show the relay I'm talking about.

It's there because if not then when you have both main engine and the genset running the alternator will see a high voltage and back off giving the alarm.

Hope this helped...
Bill & CJ
'99 Allure 36' #30307
Enjoying it while we can. 190,000 and counting!
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Old 09-02-2017, 01:05 PM   #4
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Join Date: Jul 2009
Location: Sequim, WA
Posts: 1,386
Here's a link to a post in the iRV2 Monaco forum that has a block diagram which may aid understanding. I saved it to my computer for future reference but have not actually reconciled it with my coach's wiring.

Batteries and Charging Block Diagram

Like Burfman said, there is a lot of similarity across brands and models.

Dave & Cathy, 2002 Country Coach Affinity, 42', #6103, CAT C12, 2018 GMC Acadia, Linux Mint
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