Glow Plug Control Module or Glow Plug Relay?

[6.0L_stroker]

So I'm working on this guys 1999 7.3 an the problem is that it won't start below 40 degrees without it being plugged in, I checked the fuel pressure, and filters, I've checked the air filter, and I've check oil level, so next, which I know I should have checked the relay and the module first, but the guy wanted the all the filters changed. So where is the module and relay an how to check

[dirtyman78]

the gp soliniod is behind the fule filter and to the left on the top of the motor, looks like the starter solinoid, thats all i could help you with im just learning these powerstrokes myself I think these are supposed to hold 12v for at least 30 sec when key is turned on

[6.0L_stroker]

Any one have a clue where the glow plug control module is

[6.0L_stroker]

So idk if this is right or not but the glow plug control module is only on the 6.0 and 6.4

[dray8165]

The module would be in the same place - You only have a glow plug control module on Excursions and California emmision trucks. You have a glow plug relay on all other trucks. Its a one or the other, not both kind of thing.

Read here about how to check out your GPR system:

Hard/No Start? Check here first. - Diesel Forum - TheDieselStop.com