Thought I'd throw this out there and see if anyone has experienced it before: 96 F350 PSD, glow plug relay cycles pretty actively when started compared to my other trucks, always has. Yesterday morning it acted like it was cycling just after coldstart, but the voltage was jumping up instead of the usual down and the lights were getting brighter with each flash. Truck quit acting up and ran fine, sat for 9 hours, went to start it and had no current when in run or start position, not even a dash light/radio. Had power in acc position. Futzed with all the fuses and relays, truck eventually started, no idea why. Truck was hard to start this morning (acted like gp were not working) and did the voltage spikes again. I'm wondering if a gpr can cause this or is there another culprit that someone would suspect?

Thank You in advance.

cfpinz

 

Usually #22 fuse under the hood pops but try this anyway, Unplug the fuel heater in the filter housing. It's the 2nd one down from the top. Be gentle with the prying the plug. There are 3 sensors on the filter housing..all on the driver side. Top is restricted fiter sensor. Bottom is water in fuel sensor.

You most likely have a couple GP's gone bad. That would make it start pretty hard and run like crap until those cylinders are warm (<1 minute)
When 1 or more GP's are bad the GPR will cycle faster than normal. It's protecting the good GP's.

 

I would check and clean all batt connections first.
Low voltage will cause the GPR to chatter.

Bill

 

Thank you both for the suggestions, will look into those items. I'm pretty confident the truck has a few bad glow plugs and it has a couple other small things that need attention. Have a list of things that I want to do to the truck when it can be left down for a few days but it's used every day to feed cows right now and usually just gets patched enough to keep it going.

Thanks again

 

Corroded Battery terminals was the culprit, if only every problem could be fixed that cheap. Thank you both for your suggestions.