Yale GLC040RD:
Ignition System wiring

I am working on a propane GLC040 Yale forklift from the early 90's for a friend of mine. It was a crank , no start and had no spark. I figured out the igniter ( ign.. module) was bad in the distributor. Since it's old and the distributor was worn, I replaced the entire distributor and ballast resistor. Engine starts and runs fine now. My question is about the wiring to the coil. There is a black wire with a red trace that goes to positive side of coil. It has power with the key in the run position. There is also a blue wire with white trace that has 12 v with key on that runs to the resistor. Then a wire leaving resistor to positive side of the coil. Shouldn't the black wire with red trace only have 12 v in the start position? It doesn't make sense that it has 12 v in the run position and also have a resistor wired to it. Any help would be appreciated.
  • Posted 11 Oct 2022 15:09
  • Discussion started by Mike_Brown
  • Maryland, United States
Showing items 1 - 3 of 3 results.
Mike you can not hook the wire for starter at key switch to coil because it will back feed after it starts through the run terminal and start cranking the truck when it is running. You could get the correct switch from the dealer and install. To do what you want to do you could add wire at s post at starter but you would have to install a diode in line from s post to coil to stop it from back feeding when running. You could just take that wire out of the circuit and just wire to ballast and see if it starts good if so don't worry about it.hope l was of help.
  • Posted 14 Oct 2022 09:39
  • Reply by Scott_
  • Pennsylvania, United States
Scott
Thank you Scott. I did find a wiring schematic that shows pin 1 thru 4 on ignition switch. Pin 4 going directly to positive of coil. I wasn't sure if it was only powered while cranking. That being said, I appreciate the help and I think you are right. Also, someone replaced the ignition switch recently with a universal 4 pin switch, probably why it has power all the time. Could I hook the coil wire up at the ignition switch on the same terminal that goes to the starter for cranking?
  • Posted 14 Oct 2022 03:54
  • Reply by Mike_Brown
  • Maryland, United States
I will try to answer this question what l remember was Yale used a four wire key switch plug in connecter the key switch was marked one to four the first was battery the second terminal was ignition to coil the third terminal was start for cranking and the fourth terminal was its own circuit that only got current in the crank position so it would apply battery voltage to the coil before the ballast resistor and then the run position would control the ballast resistor. /hope this answered your question
  • Posted 14 Oct 2022 02:24
  • Reply by Scott_
  • Pennsylvania, United States
Scott

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