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Message: <blockquote data-quote="DaleM 753" data-source="post: 139415" data-attributes="member: 25976"><p>Hi All, I have a 1991 Model 753 (508613765).  My glow plugs are not working and I'm just starting into my troubleshooting.  On my machine, when I take my key to ON, after the initial display light-up, my glow plugs will automatically come on for a timed duration if the coolant temp is cold enough.  If so, the display will show GLO XX with the XX being the seconds the plugs will be energized - 5, 10, 15, etc.   This part seems to work fine as I see the plug countdown when temps are cold.  I do NOT, however, get voltage at the bus bar across the plugs during the countdown.  From what I've read, there is typically a relay feeding the plugs.  My O&M manual does not tell me where that relay is.  I have several relays in the engine compartment under the air cleaner, and also some off the cab harness mounted on the back of the cab near where the "computer box" (not really sure what it is) mounts.   Short of tracing wires, any way to know what relay feeds my plugs?  Aside from the relay and bad connectors, any other starting point suggestions?   Thx all.  Dale M</p></blockquote><p></p>