Charging gauge suddenly not working at all.

[builder77]

I changed my fuel filter the other day on my M1009, and since that I did that my charging gauge is not working at all. The CUCV runs fine otherwise. In the process of bleeding the filter out by myself the drain line came lose and I managed to soak the rear passenger corner of the engine compartment fairly well. I assume that is probably what caused this new problem. I had hoped that once things dried out it work again, so I have not yet started poking around. Any ideas?

 

[CUCVFAN]

Well, since diesel doesn't dry out very well it could still be a problem. Did you check the 28V fuse?

 

[builder77]

There is a 28v fuse Still learning here. Where is that located? I located most of the civi 12V stuff with my earlier electrical problems.

 

[gasser]

It's the 'only' fuse on the bottom row.

-graham

 

[aboonski]

The Battery Guage on most or all of the CUCVs (M1008 & M1009) is actually a 12 volt guage that should have been a 24 volt guage. You can test your guage to see if it is still good by jumping across the white resistor on the back of the guage with a 12 volt power source - just touch one of the leads to the post at the opposite end of the resistor momuntarily to see if the guage moves - if it does, your resistor is bad. I purchased a ceramic resistor at a local electronics store here in Melbourne Florida for 50 cents and bridged the gap between one end of the bad resistor and the other post and my guage runs just fine. I'll post a picture of the finished product. Another person on this web site provided the technical knowlege of how to troubleshoot and fix the guage so I cannot accept full credit here.

 

[builder77]

Interesting stuff there aboonski. I checked the fuse and it was ok, but I have not had time to do much other poking other them pulling loose the instrument panel. I managed to fix the instument panel lights, and the glow plug light. Unfortunatly I had to cut the grass before it started raining. There is something wrong with having to cut the grass in January in Virginia.

 

[1956_4x4]

This might be a dumb question, but I can be pretty good at coming up with dumb questions. Does this resistor reduce the voltage to 12 volts? If it does, can I just bypass it since I have converted to a 12 volt system?

Smitty

 

[builder77]

Well I checked the gauge and it appears to work. I also checked my charging voltages, and it does appear to be charging. I am betting that the problem is where ever that gauge actually connects to sense the charging voltage. Given what caused this I am expecting that to be located to the passenger side of the fuel filter where I doused it with fuel. I am going to try to work on this this evening.

Smithy I don't know enough to answer that even though it does make sense.

 

[CUCVFAN]

I've never had to replace one, but according to the TM, there is a relay (somehwere under the dash?) that sends 28V to the gauge when the key is in the run position. It could be bad.

 

[builder77]

Ok I will look for that relay. I was reading past threads, and I got the idea that that relay told the alternators to charge. I had ruled that out before due to that thinking.

 

[CCATLETT1984]

This might be a dumb question, but I can be pretty good at coming up with dumb questions. Does this resistor reduce the voltage to 12 volts? If it does, can I just bypass it since I have converted to a 12 volt system?

Smitty

you can just get a normal 12v voltmeter, its the standard size.

 

[1956_4x4]

This might be a dumb question, but I can be pretty good at coming up with dumb questions. Does this resistor reduce the voltage to 12 volts? If it does, can I just bypass it since I have converted to a 12 volt system?

Smitty

you can just get a normal 12v voltmeter, its the standard size.

True, but if this will work I can save a couple of $$$ .

Smitty

 

[Hasdrubal]

My volt gauge hasn't worked for over a year. Like to try that resistor fix. What are the values for that resistor, ohm's, watts etc...not having any luck asking for a 12v resistor here.

 

[84cucv1ton]

i would like to know to, so i could do this to mine

 

[84cucv1ton]

anyone?