mitch504
Senior Member
I have a '92 F-SuperDuty w/ a mechanical 7.3 and a 5 speed. This is a computer-free truck.
There is a glow plug controller at the rear of the intake. It has a relay mounted to it that is very similar to a Ford starter relay. One of the large terminals on this relay has battery voltage at all times. The other large terminal is connected to the glow plugs, and it has 6.5 to 7 volts when the key is first turned on.
When my glow plugs were working, I would see a big drop on my dash voltmeter for a few seconds when the key was first turned on, then it would come up to normal, then cycle every few seconds if you didn't start the truck. Now, there is no drop on my volt meter, which suggests that the large glow plug load is not being applied.
This suggests to me that the problem is in this relay, since that is where the big voltage drop is. I wanted to run this by those of you who are more familiar w/ these engines than I am before I changed this relay.
I just got this truck this summer, and have no experience w/ light duty diesels.
Thanks guys,
Mitch
There is a glow plug controller at the rear of the intake. It has a relay mounted to it that is very similar to a Ford starter relay. One of the large terminals on this relay has battery voltage at all times. The other large terminal is connected to the glow plugs, and it has 6.5 to 7 volts when the key is first turned on.
When my glow plugs were working, I would see a big drop on my dash voltmeter for a few seconds when the key was first turned on, then it would come up to normal, then cycle every few seconds if you didn't start the truck. Now, there is no drop on my volt meter, which suggests that the large glow plug load is not being applied.
This suggests to me that the problem is in this relay, since that is where the big voltage drop is. I wanted to run this by those of you who are more familiar w/ these engines than I am before I changed this relay.
I just got this truck this summer, and have no experience w/ light duty diesels.
Thanks guys,
Mitch