Why are my glow plugs short cycling
 

I had to put a new glow plug relay on due to the old going bad. The job is as simple as it get working on a diesel. The long and short of it is That I am getting very short cycles and the truck is struggling to start in the 15-20 morning temps that we have right now. The old before it went bad did what it was supposd to do. This problem is also intermitent every
10th cycle it works as it should. What is the deal.

R ur batteries week from crankin it so much thats what mine did utill put charge on them then it short cycled once got it started was good after that unless they sold u bad relay

that what i am thing maybe bad relay these relays has small computer broad in them

also like Mud said make sure batteries up charge good and make sure all your grounds clean and good

The only thing I can think of are the batteries of the relay itself, The old had a short in it that killed my batteries. I jumped the truck and got it running, left it running for about an hour to charge the batteries. They seem ok now but will change them out as funds allow, The winter months are sometimes slow for me. if the batteries don't do it then the unit is going back to carquest to be exchanged.

these pics are the parts in side relay that can be the problem for short glow light

The unit is brand new it should have no issues at all, I'm gonna return it after I change out batteries just to be sure.

just because new don't mean it good sure you that just trying help you out

your alt may not charge ur batt. enough should put on slow charge. plus watch jumping it could burn out relay!And disconnect pos. on bat wen charging u prob. no that but some people dont just makin sure:c:

I'm gonna just run with it for the next week or so, I have a couple big jobs I need to finish before I can do anything with it. the batteries are 8-9 years old now so it might be good to just get them out of there anyway. I'm going to have the alternator tested soon too but it holds 14 volts when its running and drops a bit with the lights and other stuff on like wipers. I think the alt. is still ok. Just frustrating all these little things that are givin me issues at this point, I maintain the truck better that most folks due to it bein my bread and butter

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Thanks guys

Ya i here ya im havin some issues rite now 2 have about 5hundred to throw at it rite now but wana get it rite the first time plus i need tires i think pmd n replace the 2 rubber fuel lines under intake i think one may have a slite leak? Start on that 2morrow wish me luck!