CMP Chassis Battery Voltage Sensor Failure?

[Bill Borden]

Hello,

I have a question regarding the CMP Chassis Battery sensor, the Chassis battery reading is 0.3V.  It doesn't matter what state the system is in, meaning plugged in, engine running, gen set running or all systems off.  The house batteries reading is normal, along with the rest of the systems on the CMP.

During all of the above the dash volt meter is reading 14 v, the Silverleaf runs from 14.3 to 13.2 v or normal.

Using a VTVM the batteries are showing normal, normal charging voltage.  The Heart interface seems to be running correctly. 

So everything normal except the CMP readout of 0.3 v.  My main concern is, can this under voltage reading on the CMP be sent to the Inverter, Isolator or charging system to continue a high rate charge when not needed, causing an overcharge condition?

I am guessing either a bad connection, fuse or sensor failure.

The question is where is the sensor or fuse is located, is there only one connection for CMP electrical sensors thru the Inverter?

I have read all the posts regarding the illusive CMP II, but no luck with addressing this problem.

So any help suggestions or rabbit hole I should follow would be helpful. 

Also if anyone has a Block diagram, circuit diagram for the CMP and a manual, that would be wonderful.

Thank you and Safe travels,




 

[Gerald Farris]

Bill,
The CMP does not have any connection to the inverter, battery isolator, or alternator. Therefore, you do not need to worry about those systems malfunctioning because of the faulty CMP reading.

I am not sure where the CMP gets it's chassis voltage reading from, but a call to Ken Carpenter at BCS may be beneficial to you in your search.

Gerald     

[Bill Borden]

Thanks Gerald for addressing my biggest concern of over charging.

II have called Ken at BCS, he remembers the sensor as current not a voltage and it is a donut shaped sensor on the battery cable.  Not sure which one.  So tomorrow i will check on it.

About 4 years ago I added a Battery cutoff on the chassis batteries, for indoor storage a Blue sea, one that can handle the current.  That has serve me well.

The chassis batteries have two sensor or additional wires coming to the terminals, a red to the positive and a black or blue to the negative.

Just to confirm, one goes to the alternator, is the other one for power to the Fan Hydraulic motor?

Thanks again for your help.

[Bill Borden]

Update, I have checked for a sensor on the Chassis batteries cable or connections nothing so far.

Also I was wrong as to the color of the two wires connecting to the Chassis batteries, Red is to the Positive and White to the Negative, not Black or Blue. 

If anyone has a block or circuit diagram of the CMP II connections, or a manual I would appreciate if you would give me a link or email it to me, thank you.

All systems seem to be working ok the voltage is up where it supposed to be.

Any suggestions would be great.

Thanks,