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Old 10-21-2018, 01:30 PM   #1
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Coach Battery Issues??

I Recently purchased a 2003 Damon Intruder. The old coach batteries were shot when I purchased the MH. I replaced them with the same type (2-6v--125AH) deep cycle batteries. The issue I had before is still present. When I charge them fully off of shore power, I unplug the shore power and the voltage on the batteries is 13.2 volts. I let the MH sit for a couple of hours with nothing on and the batteries drop to about 12.6 volts. I'm realizing I may have a short or something drawing power when the MH is just sitting there. I have always had this issue with the battery disconnect switch just switching to store mode at about 12.5-12.6 volts by itself. Has anyone had this issue with possibly a bad relay in the battery disconnect switch? If this switch or relay is faulty could it possibly drain down the batteries?

My battery disconnect switch is a-- Intellitec BD1.

Thanks for your replies in advance!!
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Old 10-21-2018, 02:26 PM   #2
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Don't think your battery is bad. 13.2v was a skin voltage. after a few hours it settled on real voltage. 12.6v is about 100% SOC.

During the time, your parasitic loads also ate some juice.
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Old 10-21-2018, 02:41 PM   #3
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Yes, that's normal behavior. Your lead acid batteries are charged at a higher voltage then settle to around 2.1 volts per cell at full charge.
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Old 10-21-2018, 03:18 PM   #4
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So should I look into replacing the battery disconnect relay? I can't switch it to USE mode, but when I turn the engine on I can switch it to USE mode and it stays on while the engine is running. When I turn the engine off, it stays in USE mode for about ten minutes and then switches to STORE mode and disconnects the batteries. Once it does this I can't switch it back to USE mode without starting the engine?


It stays in USE mode when plugged into shore power.

Thanks countryfit and sonic for the battery INFO, much appreciated!!
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Old 10-21-2018, 04:37 PM   #5
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There's are several threads on IRV2 about the BD1 that may be helpful.
This document has a couple of simple troubleshooting steps:
https://www.intellitec.com/assets/pd...-100_rev_c.pdf
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Old 10-21-2018, 04:58 PM   #6
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Quote:
Originally Posted by RVD13 View Post
I Recently purchased a 2003 Damon Intruder. The old coach batteries were shot when I purchased the MH. I replaced them with the same type (2-6v--125AH) deep cycle batteries. The issue I had before is still present. When I charge them fully off of shore power, I unplug the shore power and the voltage on the batteries is 13.2 volts. I let the MH sit for a couple of hours with nothing on and the batteries drop to about 12.6 volts. I'm realizing I may have a short or something drawing power when the MH is just sitting there. I have always had this issue with the battery disconnect switch just switching to store mode at about 12.5-12.6 volts by itself. Has anyone had this issue with possibly a bad relay in the battery disconnect switch? If this switch or relay is faulty could it possibly drain down the batteries?

My battery disconnect switch is a-- Intellitec BD1.

Thanks for your replies in advance!!
It sounds like your isolation relay is dropping out, not your disconnect.

The isolation relay cross charges the batteries if there is some charging above 13 volts and it will disconnect at 12.6 volts.

See if you can send some pictures of the relay or relays your talking about.

Your battery disconnect relay may not be working at all. The isolation relay may be closing and supplying all of your power.
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