problem with my ford agin

[powerplant]

Well i changed the gpr on my early 99 and i still dont have any power on the other side with the key on . im so sick of working on this truck. i guess its all the years i had chevy and said the old saying found on road dead about fords. any ideas on my problem thanks.

[sldghamr]

have you changed your fluids/filters lately??
have you used injector cleaner lately??

[powerplant]

yes i do both on every 3,500 to 4,000 on oil and use fuel additive every fill up. fuel filter every 10,000 the truck has only got 93,000 on it and has not worked very hard it pulls a travel trailer locally. its the no power on the glow plug side of the relay thats the problem now.

[Dave]

does it have power on the battery side?

[alabamafrog]

There should be power on one big wire and one little wire, when the key is turned on the computer should ground the other little wire which will energize the relay and put power on the other big wire. Is the relay clicking when the key is first turned on? Do you have power on the one little wire? Is the computer grounding the other little wire?

[powerplant]

Ok i went out this morning first start of the day and the relay worked i had 11.5 volts on glow plug side. Yesturday when i tryed to check it it was after the truck set how ever long it took to change the relay 30 minutes or so. Question it was 60 out side and i had the volt meter under the hood and had some one else turn the key thats when i got nothing dont the glow plugs burn every time you start the engine just different lengths of time depending on temp. Thanks for the help Im going to run the test agin in the morning.

[alabamafrog]

Not certain but I believe if the is over a certain temp, like around 100 or more, then they may not turn on at all. If the motor is room temp then they will turn on. They will also stay on a lot longer than the wait to start light stays on.

[powerplant]

Frog are you talking about air temp or motor temp. Ive check it a couple more times after truck has set for a couple hours and over night and everything is working fine. Thanks for the help. Like to no as much about what im driveing as possibe.

[alabamafrog]

motor temp

[NCHornet]

Sounds like you got it worked out. If you ever need another GPR I highly suggest using the HD Stancor model. If you used the 109 from Napa I haven't seen them last much longer than a year or two.