Posted by Bob on January 02, 2020 at 21:38:39 from (64.255.159.199):
In Reply to: are my glow plugs bad? posted by farmer rock on January 02, 2020 at 17:50:45:
First thing to do is to check all the glowplugs.
When one or more GP's fails current draw is reduced accordingly and the controller gets confused and thinks the GP's have heated up.
If GP's are all OK the controller may well have failed or the solenoid, they have been problematic.
I am not at all in favor of a manual pushbutton for GP's UNLESS they are the self-regulating type and will not overheat and pop open if someone holds the button too long as WILL happen sooner or later. And the originals in your truck are not self-regulating or rated for a constant 12 Volts. When that happens, they may break off while the engine is running and get pounded into the top of a piston, or break off when you try to remove them, necessitating removal of the head to retrieve the piece.
I have updated quite a number of Fords, GM's, an IH 424 tractor and even a Cadillac to a newer-style all-in-one controller and alternate GP's, which MAY be cheaper than replacing the nearly obsolete OEM controller form that era.
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