Need wiring diagram for 1999 Ford 7.3 glow plug relay. - Fixya wwwa›Forum›Cars & TrucksNeed wiring diagram for 1999 Ford 7.3 glow plug relay. Need the wiring diagram for a 1999 7.3 FOrd Superduty glow - Cars & Trucks question 1999 Ford f-350 7.3 power to the glow plug solenoid Dec 06, 20121999 Ford f-350 7.3 power to the glow plug solenoid when key is on fuses and relays are new,glow plugs - Answered by a verified Ford MechanicHi, I’m Chris. Welcome and thanks for asking your question! At your glow plug relay is there wire colors matching below When the key is turned to run is the glow plug/wait to start light coming on? If so, with the key on are there no pins at the relay showing battery voltage?From your reply I can not tell if you were responding if any wires show power or not? You are looking at the glow plug relay and not the intake heater relay, correct? Will the truck start? Is fuse 24 (30amp) under the hood good and showing power all the time? Is fuse 30 (30amp) under the dash good and showing power with the key on?With the key on is there power to the RED wire at the IPR solenoid and to the brake pressure switch RED wire?The IPR is in on the back side of the high pressure oil pump in the top front center valley of the engine . The BPS is mounted to the end of the brake master cylinder (if you have cruise control ).Okay this means there is a problem where you PCM relay is not powering up. see the diagrams below. Pull the PCM relay out and with the key on see if pin 85 is ground, pin 86 and 30 are power. If there good, the relay should click every time you turn the key to run. Let me know the results or if you have problems doing this.The PCM relay is in the fuse box under the hood called the power distribution box.See the image below.Is there now power to the IPR with the key on? The PCM relay powers the glow plug relay on the coil side at the small red wire as well as powers the IPR and fuel pump relay. If there is no power going from the PCM relay to these components then we need to start looking for a broken wire prior to the splice. Shown in the first wire diagram sent about 45 minutes ago.ThanksSince the PCM relay is working and the fuel pump relay is working this means you need to find the broken wire not sending power to the glow plug relay and IPR. Below I have highlighted the suspect area and the connector to check for this power. We may also need to check and see if the PCM is even being powered.
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