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post #1 of 11 (permalink) Old 10-25-2019, 09:51 AM Thread Starter
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3 batteries, 2 not charging

Just installed all new batteries in my Rhino 660. Replaced as per original owner build using a 12v 35ah deep cycle agm battery for startup, and 2 Odyssey pc925 batteries for sound system and lighting. Original build also included Warn battery isolator. It appears the isolator is only hooked up to the 2 Odyssey accessory batteries.
Took car out to California City a couple of weeks ago, ran sound and light system...came back and parked it. Yesterday did a battery check and discovered the 2 Odyssey accessory batteries are both reading identical at 6.4 volts while the main battery is at 12.8 volts.
Before I start testing for parasitic drain, charging system, etc. hoping to get some insight on those using second or third battery setup.
I did read somewhere that isolators won't charge the second batteries unless the main battery gets to 13.3 volts. If that's the case, is it possible the charging system isn't capable of reaching that minimum and the 2 Odyssey batteries aren't getting any charge...ever?
Papa SXS
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post #2 of 11 (permalink) Old 10-25-2019, 11:25 AM
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Originally Posted by papa SXS View Post
Just installed all new batteries in my Rhino 660. Replaced as per original owner build using a 12v 35ah deep cycle agm battery for startup, and 2 Odyssey pc925 batteries for sound system and lighting. Original build also included Warn battery isolator. It appears the isolator is only hooked up to the 2 Odyssey accessory batteries.
Took car out to California City a couple of weeks ago, ran sound and light system...came back and parked it. Yesterday did a battery check and discovered the 2 Odyssey accessory batteries are both reading identical at 6.4 volts while the main battery is at 12.8 volts.
Before I start testing for parasitic drain, charging system, etc. hoping to get some insight on those using second or third battery setup.
I did read somewhere that isolators won't charge the second batteries unless the main battery gets to 13.3 volts. If that's the case, is it possible the charging system isn't capable of reaching that minimum and the 2 Odyssey batteries aren't getting any charge...ever?
Papa SXS

I've never used an isolator before (I'm old school and use a constant duty solenoid) but looks like it might be wired backwards - shouldn't it be "one in' and "two out"?.
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post #3 of 11 (permalink) Old 10-25-2019, 11:39 AM Thread Starter
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Sandbuster, confused by what you mean by "one in and two out..." Are you referring to how the 2 batteries are connected to isolator?
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post #4 of 11 (permalink) Old 10-25-2019, 12:05 PM
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Man for a build like that with so few hrs you r havin some problems, i feel for ya. Hang in there it will b worth it once u get that beast runnin right


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post #5 of 11 (permalink) Old 10-25-2019, 01:51 PM
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Originally Posted by papa SXS View Post
Sandbuster, confused by what you mean by "one in and two out..." Are you referring to how the 2 batteries are connected to isolator?
Papa SXS

Referring to the isolator (which I don't have much expertise on), where the isolator is labeled "IN" you have two cables attached and one cable coming out the side marked "OUT" - it just seems like it should be wired reverse of that? Maybe my thinking just needs to be "rewired".. Maybe I need to ask which side of the isolator is the charging side?
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post #6 of 11 (permalink) Old 10-25-2019, 02:10 PM
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Sandbuster...I think what you see is the Rockford Fosgate AMP relay. The isolator is under dash and not pictured. lol
Brian Lee. Rhino is going up for sale. Just picked up a 2019 Wolverine. I love the Rhino but it's' more for the gals/g-kids and the Wolverine is a better fit.

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post #7 of 11 (permalink) Old 10-25-2019, 02:37 PM
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Sandbuster...I think what you see is the Rockford Fosgate AMP relay. The isolator is under dash and not pictured. lol
Brian Lee. Rhino is going up for sale. Just picked up a 2019 Wolverine. I love the Rhino but it's' more for the gals/g-kids and the Wolverine is a better fit.
That explains it. Good luck with the awesome Wolverine!
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post #8 of 11 (permalink) Old 10-25-2019, 06:07 PM
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NEVER SELL THE RHINO tex.
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post #9 of 11 (permalink) Old 11-02-2019, 05:54 AM
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If the batteries are not getting charged it is because the isolator is not letting them. The isolator is probably doing it's job by not letting the two aux batteries get charge. Check your charge system,you should be getting 14.1-14.4 volts at your main battery when running. If not you smoked your stator.

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post #10 of 11 (permalink) Old 11-06-2019, 07:17 AM
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Where is the isolator? I donít see it in the pic.

Is the isolator hooked up to the rhino at all or just to the 2 odyssey batteries.

Maybe the 2 batteries were connected to the stereo and lighting as a stand alone battery source only to be charged at home or at camp and never by the rhino itself as the rhino has very little extra output to run or charge batteries


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post #11 of 11 (permalink) Old 11-06-2019, 10:39 AM Thread Starter
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The isolator is not pictured...it's up under the dash. The way I understand it is the isolator directs the charging system to the main starting battery and when it receives full charge then allows the secondary batteries to charge. If Rhino charging system struggles to keep main battery charged it won't transition over to secondary batteries and yes, they will have to be charged at camp, etc.
I read somewhere that the isolator only switches over to secondary batteries when main starting battery has reached 13.3 volts.
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