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Old 07-29-2014, 08:14 AM   #29
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Hmmmm....Still no joy with the battery monitor. Crawling around the back of the van I spotted what may also be a problem. Even if the monitor stopped "Thinkn" it would not see any the loads across the shunt....except through the inverter. It looks like all the 12v loads are parallel to the shunt...instead of THROUGH the shunt as shown in the hookup instructions. The only loads the shunt would see are those coming through the inverter. I am no electrical engineer (actually mechanical engr) but it sure looks like a screw up to me. (on the part of my installer-not Airstream) I don't know.....so I am going to be "Thinkn" about this myself for a bit. All systems functioning, except monitor, so it can wait until I get back home in Oct.
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Old 07-29-2014, 09:36 AM   #30
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Definitely an 'AH HA!' moment. There are several grounding bus bars and negative frame mounts in the AI, which makes it difficult to get all of the negative loads running thru the shunt. Try using a binding post on the output side of the shunt (non battery side) to attach cables to any bus bars or other grounds that you can find. You can also slide the batteries out of the box and 'insert' the shunt between the battery negative and the original negative cables, add the inverter negative and you should be ready to go. Hopefully that will solve your problem.

PS: Was this the first BMK that the installer did?
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Old 07-29-2014, 09:56 AM   #31
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Lewster...thanks for the suggestions. The battery box looks most promising to me. Seems it would be a simpler hookup. (For some reason, the Magnum instructions say not to put the shunt in the battery box, but worth a call to them to find out why, or a re-read on the manual/instructions)
The installer seems to know his stuff and has been spot-on with other questions and instructions. I will give him the benefit of a doubt this time, and lump it up to the spring rush.....2 techs working a 10 bay RV shop. We ARE going to discuss it when I get back.
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Old 07-29-2014, 10:40 AM   #32
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Lewster....here is what Magnum has to say about the shunt.
Info: Shunts should be mounted in an area where freely circulating
air is available. For continuous operation, it is recommended that
shunts are not used at more than 2/3 of their rated current. If this
is not possible, adequate forced ventilation should be provided to
keep the shunt operating temperature below 60C.
Guess its going to be a little more complicated afterall.
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Old 07-29-2014, 03:03 PM   #33
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Since all negative loads start at the battery negative terminal, the easiest thing to do is place the shunt between those cable(s) and the battery negative. Add another cable of proper size between the shunt and battery negative and then add the inverter negative to the load side.

That should cover all the bases.


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Old 07-30-2014, 11:34 AM   #34
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Lew, Many thanks for your insight and advice. I hope to get this mess straightened out. There are going to be 2 stages to this fix. First to get the tie-in points correct to see all of the loads. Second to verify that the sensor module wasn't fried by a bad installation step. Magnum indicated the sensor may be faulty considering the strange readings I am still getting after the hard reset. ( 128. amps DC and the AMPHR I/O just keeps rising...even under a load with no power into batteries) It still says "Thinkn", but I think it really means to say "I GIVE UP"....just not coded into the display that way. Fortunately, none of this is a show/trip stopper so it can wait until I am home.
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Old 07-30-2014, 10:26 PM   #35
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Keep me posted!
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Old 07-03-2015, 07:28 PM   #36
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Need help. Returned from trip and found 110 power to Interstate had tripped and batteries were dead. Reset 110 GFI and Magnum monitor registered fault no comm. Checked Magnum manual for fix. Removed monitor, unplugged telephone wire for 5 seconds, and replugged. Got brief flash of green but returned to red no comm fault. Repeated several times with same results. What's my next step.
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Old 07-03-2015, 09:05 PM   #37
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I just encountered the same fault after killing my house batteries. I started the engine and for some reason that cleared it. Good luck.
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Old 07-03-2015, 09:55 PM   #38
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Quote:
Originally Posted by pebbrb05 View Post
Need help. Returned from trip and found 110 power to Interstate had tripped and batteries were dead. Reset 110 GFI and Magnum monitor registered fault no comm. Checked Magnum manual for fix. Removed monitor, unplugged telephone wire for 5 seconds, and replugged. Got brief flash of green but returned to red no comm fault. Repeated several times with same results. What's my next step.
Try a 'hard re-set'. Remove the positive power feed to the Magnum (since you don't have a disconnect switch, which I always include in my installations) by removing the inverter fuse from the line. Also remove the telephone style cable at the inverter that leads to the remote monitor and be sure that there is no 120VDC going into the unit. Wait 15 minutes and attach everything in reverse.

If that doesn't re-set your problem, you might have a bad board internally and need to contact a factory authorized Magnum service center for service.
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Old 07-04-2015, 06:52 AM   #39
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NOLA russ and lewster - Thanks for your prompt help. Tried NOLA russ suggestion first and it worked. All is well. Will keep lewster's direction on file for future trouble shooting.
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