Murphy switches

L

Leafguy

New member
About to replace my murphy switch on my morbark 6" chipper. This will be the second time this season. Is it common for these to crap the bed or should I be looking for another issue on the machine that would be making the switch die.

I've check all wires and the the battery is good. The machine will turn over but not start. When I turn the key to the start position none of the gauges move which they normal do.

Any insight would be great.
 
I thought my murphy switch was going. Turned out to be the failsafe plug for the disc compartment door. You know, the one that prevents the engine from being able to start if you are servicing the knives or disc.
 
A bad battery connection can cause some crazy things to happen. We were jumping the solenoid for awhile because the ignition just wouldn't start the machine. But a screwdriver across the two posts on the solenoid would start it just fine. It took two people to start it though, and sometimes that 2nd guy was in the tree.

So, we had it tested after trying many things unsuccessfully. The mechanic cleaned the battery posts, the cable connectors, clamped it all back together and no problems since. I personally didn't understand why the battery would start the machine the way we were doing it, but not via the ignition. I thought cold cranking amps were cold cranking amps. Go figure...
 
TreeLogic. There wasn't enough power going to the solenoid switch to trip it so it could transfer power to the starter. They must have cleaned or moved that connection when they cleaned the battery posts. Corrosion on connectors are the number one reason an engine won't start.
 
Leafguy said:
About to replace my murphy switch on my morbark 6" chipper. This will be the second time this season. Is it common for these to crap the bed or should I be looking for another issue on the machine that would be making the switch die.

I've check all wires and the the battery is good. The machine will turn over but not start. When I turn the key to the start position none of the gauges move which they normal do.

Any insight would be great.
Click to expand...
check you fuse(s)
ours was corroded/weak spring clamping the fuse
caused an intermittent shut down/ no start....
look for the simplest things first before throwing parts at it.

We also had a fail safe plug connector corrode... pull on wires, some times a weak/poor connections one will let go.
 
After reading this thread I got onto a google search of dialectric grease. One guy who says he is an electrical engineer and writes convincingly and broadly presents a very good case for using it on connections to keep out moisture and corrosion. Sounds like it will save me some frustrating down time in the future.
 
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