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Old 04-02-2011, 05:11 PM   #1
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Chassis Batteries Not Charging

Hello All, I've noticed that my chassis batteries are not charging. A little background before I proceed. When we purchased our 07 Knight we found out the Monaco omitted the dual battery isolator in the front electrical circuit board. I purchased the part MT960DC from Mega Parts and it was installed. The other day I was checking battery condition and noticed that the chassis batteries read 9.6 volts. Since these batteries were nearing replacement time I decided to replace the batteries since summer is upon us. After installation, I started to check battery status on a day to day basis a noticed that the chassis batteries were reading daily at 12.6. I have since checked the voltage on the Trombetta relay in the battery compartment. I get a reading of 13.3 on the left top side of the relay and 12.6 on the right. I decided to remove the black wire on the front of the relay, I did hear a click, but the voltage remained the same, no change. I understand that this relay is mainly for the battery boast but is it also used in conjunction with the MT960DC to charge the chassis batteries? If so I think this is my problem, if not it must be the MT960DC isolator. Any assistance would be appreciated. Thanks
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Old 04-02-2011, 07:57 PM   #2
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I understand that this relay is mainly for the battery boast but is it also used in conjunction with the MT960DC to charge the chassis batteries?
You are correct. I assume the 12.6 side of the solenoid leads to the house batteries? The boost switch uses the same path as the alternator to open circuit in solenoid. I have replaced two solenoids on our Monaco. Word on the street is these solenoids are crap.
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Old 04-02-2011, 09:15 PM   #3
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Trombetta make two dimensionally identical "Bear" contactors - 114-1211-010 which has copper contacts that are subject to verdegris corrosion (supplied as OEM by Monaco). The other is 114-1211-020 which has silver composition contacts that withstand corrosion much better. Available at a very resonable price from:

Trombetta Bear DC Contactor Family

Dennis
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Old 04-02-2011, 11:25 PM   #4
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Monacoach/DP01, Thanks for the information. I will order one tomorrow.
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Old 04-08-2011, 06:48 AM   #5
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Chassis Batteries

I put one of those MT960 boards on my old (2005) Endeavor. I never could get it to work right so I took it off. Since, I have heard similar stories from other people who bought them.
Ed Robbins
2011 Monaco Diplomat DFT
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Old 04-10-2011, 12:59 PM   #6
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DP01. Today I installed the new Trombetta relay, 114-1211-020 which has silver composition contact. Everything seems to be working again just fine. I ordered the relay from Murcal as you recommended. It cost about $40 with shipping which is extremely reasonable. Thanks for your information.
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