Bio-Bradley
Registered User
Calling all 7.3 idi experts, shade tree mechanics and enthusiasts...
I've got an 89 ford f350 7.3 idi. It's got an aftermarket glow plug solenoid/relay. This system is installed as follows: purple wire goes from +battery terminal to the push button switch on dash(now there is an inline fuse here where there was not one before) (see pic IMG_0295). There is another purple wire that goes from the push button switch to the glow plug solenoid (S terminal). One of the solenoid terminals house the yellow wires coming from the +terminal on the starter solenoid and the opposing terminal has the orange wires that go to the glow plugs. (see pic IMG_0298 & IMG_0299). Pic IMG_0299 show the red factory wire and blue wire for WTS light disconnected and terminated. The solenoid I removed looks identical to the new ones. Unfortunately it was brittle and broke apart when loosening the nuts on the larger terminals so I can't use it anymore.
The problem: Originally I was noticing fluctuating voltage on my voltmeter (location is A-pillar) when I press the glow plug button. It used to be consistent. I've installed 3 different new solenoids thinking the solenoid was the issue. Two from Standard (RY175) and one from NAPA (GPR200) rated for diesel 89 ford f350 7.3 idi glow plug solenoid. With each installation, there is no longer a voltage drop registering on the volmeter and the glow plugs no longer heat up. I have tested each glow plug using a light-up circuit tester by attaching to the +terminal on the battery & to the top of the unplugged glow plug. The light turns on when I make contact on all 8. I've done the same with the 8 wiring caps that attach to the glow plugs showing the same result of the light coming on. I have replaced the push button glow plug activator on the dash as well. Electrical work is not my strong suit. I have installed the glow plug solenoid just as the old one was installed. Now, when I push the glow plug button under the dash, I no longer get a voltage drop and the glow plugs don't heat up. ***. BTW, I can start the truck after the block heater has been plugged in for a few hours. Weather today in Washington is 75F & sunny. Truck is parked in the garage.
Have I wired it wrong? Should I wire it differently? Other test options to help isolate the issue? It seems to me that the solenoid is not getting the power it needs to activate allowing the stronger amperage to flow to the glow plugs. Thoughts? Any and all advice is welcome!! Thanks in advance for your perspectives.
I've got an 89 ford f350 7.3 idi. It's got an aftermarket glow plug solenoid/relay. This system is installed as follows: purple wire goes from +battery terminal to the push button switch on dash(now there is an inline fuse here where there was not one before) (see pic IMG_0295). There is another purple wire that goes from the push button switch to the glow plug solenoid (S terminal). One of the solenoid terminals house the yellow wires coming from the +terminal on the starter solenoid and the opposing terminal has the orange wires that go to the glow plugs. (see pic IMG_0298 & IMG_0299). Pic IMG_0299 show the red factory wire and blue wire for WTS light disconnected and terminated. The solenoid I removed looks identical to the new ones. Unfortunately it was brittle and broke apart when loosening the nuts on the larger terminals so I can't use it anymore.
The problem: Originally I was noticing fluctuating voltage on my voltmeter (location is A-pillar) when I press the glow plug button. It used to be consistent. I've installed 3 different new solenoids thinking the solenoid was the issue. Two from Standard (RY175) and one from NAPA (GPR200) rated for diesel 89 ford f350 7.3 idi glow plug solenoid. With each installation, there is no longer a voltage drop registering on the volmeter and the glow plugs no longer heat up. I have tested each glow plug using a light-up circuit tester by attaching to the +terminal on the battery & to the top of the unplugged glow plug. The light turns on when I make contact on all 8. I've done the same with the 8 wiring caps that attach to the glow plugs showing the same result of the light coming on. I have replaced the push button glow plug activator on the dash as well. Electrical work is not my strong suit. I have installed the glow plug solenoid just as the old one was installed. Now, when I push the glow plug button under the dash, I no longer get a voltage drop and the glow plugs don't heat up. ***. BTW, I can start the truck after the block heater has been plugged in for a few hours. Weather today in Washington is 75F & sunny. Truck is parked in the garage.
Have I wired it wrong? Should I wire it differently? Other test options to help isolate the issue? It seems to me that the solenoid is not getting the power it needs to activate allowing the stronger amperage to flow to the glow plugs. Thoughts? Any and all advice is welcome!! Thanks in advance for your perspectives.
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