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Electrical Issue, Where to Start

dk8019

Active member
802
55
28
Location
Lovettsville, VA
I've read a few of the related articles , and I have a couple of questions on where to start with some electrical issues on the M814.

I've driven it around a bit, and a few days ago, while making a short trip back I noticed my voltage meter had pegged out. I couldn't get it to go down, and all the other gauges in the truck where acting strange, so I disconnected them as I had before on an earlier trip. I drove the remaining few miles home, parked it as normal and waited for it to cool down.

I noticed while walking around it that the headlights were off, even though they had been on before, but figured they must have just died.

I shut the truck down and then yesterday I went to move it again, and when the battery switch was moved to the on position I recieved no reaction from any component. When the engine starter switch was moved to the start position, nothing either. I open the fuel switch and then fired it up by shorting the main power from the starter to the solenoid, and she lit right up.

I'm guessing the over voltage fried the control box, and I should start there, correct? I pulled the alternator and replaced the regulator section, hoping that's the issue. It looks like 24V is everywhere it is suppose to be.

Eastern Surplus has used control boxes for $150, is that a decent deal?
 

badgmc56

New member
440
5
0
Location
Southington Ct.
You should check to see right at the batterys if indeed you have an overcharging problem first before you start throwing parts at it. Could be bad grounds, open , shorted wires or combination of all.
 

TigerHawk

New member
79
0
0
Location
Small Town USA
Troubleshooting...

The first thing I would check is that you have a good ground. If it starts ok then your battery to frame ground is probably ok. Run a new ground wire from your panel set to a good frame ground for testing. Put a voltage meter across the batteries and test the voltage. I still think it sounds like a grounding issue.

Good luck!



I've read a few of the related articles , and I have a couple of questions on where to start with some electrical issues on the M814.

I've driven it around a bit, and a few days ago, while making a short trip back I noticed my voltage meter had pegged out. I couldn't get it to go down, and all the other gauges in the truck where acting strange, so I disconnected them as I had before on an earlier trip. I drove the remaining few miles home, parked it as normal and waited for it to cool down.

I noticed while walking around it that the headlights were off, even though they had been on before, but figured they must have just died.

I shut the truck down and then yesterday I went to move it again, and when the battery switch was moved to the on position I recieved no reaction from any component. When the engine starter switch was moved to the start position, nothing either. I open the fuel switch and then fired it up by shorting the main power from the starter to the solenoid, and she lit right up.

I'm guessing the over voltage fried the control box, and I should start there, correct? I pulled the alternator and replaced the regulator section, hoping that's the issue. It looks like 24V is everywhere it is suppose to be.

Eastern Surplus has used control boxes for $150, is that a decent deal?
 

dk8019

Active member
802
55
28
Location
Lovettsville, VA
Guys,

It looks like the overvoltage issue is corrected, it appears something on the regulator took a dump and burned up resulting in the crazy overvoltage situation. I'll se if I can get the gauges on and running correctly today.
 

dk8019

Active member
802
55
28
Location
Lovettsville, VA
Well, I spent a bit of time troubleshooting, turns out the main battery control switch was bad, or at least one side of it was. Replaced it with a spare, and she's back up and running. Now the stripping and painting begins!
 

TigerHawk

New member
79
0
0
Location
Small Town USA
Gret job!

I glad it was a simple fix!

Well, I spent a bit of time troubleshooting, turns out the main battery control switch was bad, or at least one side of it was. Replaced it with a spare, and she's back up and running. Now the stripping and painting begins!
 

mckeeranger

Member
779
4
18
Location
Eastern Kentucky
Well, I spent a bit of time troubleshooting, turns out the main battery control switch was bad, or at least one side of it was. Replaced it with a spare, and she's back up and running. Now the stripping and painting begins!
I recently had the same problem with my M817. It cost me 2 alternators, then I found this article. I replaced the switch and everything seems fine.

Thanks for the info.
 
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