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Old 11-26-2013, 06:32 AM   #1
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Converter Question

Replaced chassis battery last year. Checking the battery voltage showed all batteries reading 13.45V. Coach batteries are seven (7) years old & I noticed the converter running more & lights dimming then going bright. So, I just replaced both coach batteries. Once installed everything was looking good, until I checked the battery voltage a couple of days later. Coach batteries are still reading 13.45V, but the chassis battery is now reading 12.04V. I don't think the chassis battery is getting charged! The lights stay bright without dimming & I can hear the converter running periodically. Is this a sign the converter is going?

Thanks for any info
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Old 11-26-2013, 08:28 AM   #2
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I would suggest you measure the voltage coming right out of the converter. It may not charge like an alternator around 13.8. It might only put out just over 12v. Not sure what normal output should be but your manual should say. Or can prob find it online.
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Old 11-26-2013, 08:45 AM   #3
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Check your battery voltage with shore power unplugged. You are not getting a true voltage reading of the batts with the converter/charger supplying a charge.
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Old 11-26-2013, 10:19 AM   #4
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What make and model year is your coach?
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Old 11-26-2013, 05:31 PM   #5
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If you have a Terra, it should charge both the house batteries, and the chassis battery, when on shore power, the engine is running. The Converters do go bad at the 3 to 4 year age, if it is plugged in 24/7. There are 2 30 (0r 40) amp fuses on the converter. Check them to see if they are still good, don't just look, actually measure voltage on both sides of the fuse. You may need to remove the converter from its mount to access the fuses. If you have the printed material that comes with your MH, read about the converter, as it tells you what voltage the converter should be putting out without being connected to the batteries. It should be a 3 stage converter, with 14.2 to 14.4 volts when first plugged in, or reconnected.

Good luck
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