Today my wait to start light stop working. Can still hear the glow plug relay working. Pulled the instrument cluster and swap light so light is not burned out. Anyone have a clue what else it could be? Glow plug relay going bad? Truck starts fine.
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Wait to start light?
- Thread starter Bigburban
- Start date
Fusible link open up to the controller? Should have 12V to it. Otherwise clean the connectors. A voltage check would be useful after the cleaning. Then have a friend kick it on and see if you get 12V on both side of the controller bolt on contacts.
Check for bad spot in glow plug wiring. There is a wire that goes from the glow plug circuit to the ecm and indicator light. I believe it is on the passenger side of the harness. I can check scematics when I get home tonight for wire color. Check for 12 volts to all the glow plugs. The glow plug harness is full of fusible links/wire.
Checked got power to and from the controller
No power to the drivers side glow plugs
power to the passenger side glow plugs
Ok took and put new glow plugs in on drivers side, tested the ones I took out and they worked. I think I have a bad wire or wires on the drivers side. Can I just run a new wire from the relay? Do I need a fuse for the new wire and what size if i do? What is the white round plastic piece that is about 4 inches from the output side of the glow plug controller that the wire runs through a resister? HELP!!
No power to the drivers side glow plugs
power to the passenger side glow plugs
Ok took and put new glow plugs in on drivers side, tested the ones I took out and they worked. I think I have a bad wire or wires on the drivers side. Can I just run a new wire from the relay? Do I need a fuse for the new wire and what size if i do? What is the white round plastic piece that is about 4 inches from the output side of the glow plug controller that the wire runs through a resister? HELP!!
The white plastic thing is a fusible link. If there is a overload on the curcuit it will melt to protect the harness from getting hot and starting on fire. It must be replaced with the exact same fusible link. A little ways into the glow plug wiring the wire changes to fusible wire going to each glow plug.There is a orange wire that goes back to the underhood fuse box. After the fuse box it splits. The orange wire continues through to the bulkhead connector and to the indicator lamp. The wire that splits off is dark blue. It goes to the ecm to tell it the glow plugs have power.
I'd probbly go to the dealer for the fusible link to be shure to get the correct one.
buddy
Active Member
To answer your question though, yes there is a fuse that is between the glow controller and the WTS light. In my 94 its called Glo fuse. And the PCM knows the plugs are working by getting power through the WTS light that is grounded in the PCM. In later trucks its probably one of your ECM fuses.
buddy
Active Member
independent sources for the light and PCM is better so that a burnt out light isnt screwing you for glow plug feedback to the PCM.