Wiring M818 Battery Switch

[burt8921]

Alright, I have viewed hundreds of threads and can't locate one directly on point. My battery switch died and after some doing, I obtained what appears to be correct replacement but of course did not label or mark leads. Switch is a four terminal but only three leads to it, one of which is hot. I can wire new switch and get juice to start truck but can't kill it other than manually and when switch off, still sending juice to fuel solenoid I assume. Can anyone direct me to a wiring diagram for switch? Technical manual of no assistance. Any help much appreciated.

 

[MWMULES]

From the TM APPENDIX E SCHEMATIC AND WIRING DIAGRAM http://trucks5ton.tpub.com/TM-9-2320-260-20/TM-9-2320-260-201328.htm

 

[burt8921]

Appreciated, but diagram shows four leads and I only have three.

 

[cranetruck]

You need to identify (by wire number) what you have. From the diagram, trace the individual wires and label them and go from there.

 

[doghead]

Is your shutoff solenoid manually opened?

Has your switch ever functioned properly for you?

 

[burt8921]

Shutoff solenoid is manually operated. New switch has not functioned properly yet and I had really decided maybe this switch was not the right switch but thought I would explore here before getting another. Could not find a wiring combination with new switch that cuts all voltage off (i.e. - can start truck but when turn switch off, still have power to fuel solenoid). Truck is on farm couple hours from where I live so I don't get to spend a lot of time diagnosing it unfortunately.