Join Date: May 2005
Location: Petaluma, CA
Feedback Score: 0 reviews
1986 F250 Glow Plug system light does not come on illuminate.
Hi. On my 1986 F250 6.9 AT, when I turn the key to crank/start, the glow plug light does not come on. (The glow plugs are NOT being energized, long crank to start).
I installed a new Glow Plug Controller and Glow Plug Relay, with no correction. I can hear the glow plug relay, "clicking" on and off, as if it it being cycled by a timer.
I have owned the truck for approx. 10 years and this is a sudden onset,new problem.
I have NO interest is converting to a manual (push button ) system. I have the 1985 Ford engine manual, but it only has a glow plug wiring diagram, no diagnostic "tree".
God Bless America!
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Last edited by mikeceli; 07-06-2019 at 08:26 PM.