[C320-list] Perkins Engine - Glow Plug Activation

[Dave Chase]

We have a '94 C320 with Perkins M30. While installing a Balmar MC-614 
regulator, I was tracing the ignition ckt wiring. I noted that the key 
switch has three connections: "Pwr", "Ignition On", and "Start". 
"Ignition On" is connected to "Pwr" when the key is turned to the right, 
which provides power to the panel and engine electronics (via a ckt 
breaker).  "Start" is connected to "Pwr" when the key is held to the far 
right against the detent and is connected to the Starter button which 
will activate the starter solenoid.

The glow plug relay is currently connected to the "Ignition On" 
position, which means that the glow plugs will be energized whenever the 
key is on. I am thinking that the relay should be connected to the Start 
position which will energize the glow plugs only while the switch is 
held to the right prior to starting. Can anybody confirm?

Dave Chase

1994 Cat 320 (#97) "Indigo"