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Old 07-22-2014, 07:06 PM
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Glow plugs heating up really slow

I just replaced my 6.9s glow plugs because they were heating up very slowly (replaced them with diesel rx plugs) and they are still not heating up right. I checked the controller and theres power coming and going through it and i can hear it when i push the button to warm the plugs so thats not a problem i think, i checked for power to the plugs and im not getting anything there. What can i do, im thinking its my batteries they were installed in 2010 and ones got acid build up. Is it my batteries or is it deeper than that?
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Old 07-22-2014, 07:26 PM
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How long do they take to heat up? It usually depends on the ambient temperature where you're at. I'm in Arizona right now, and the glow plugs shut off after 5 seconds, when I'm in Oregon, they run for 15-20 seconds.
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Old 07-22-2014, 08:08 PM
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its been around 90 here in louisiana and it takes me 10-20 minutes to get the plugs warmed up.
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Old 07-22-2014, 08:34 PM
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just checked my plugs im getting absolutely no power to the plugs.got power going to the controller and from the controller but none to the plugs.
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Old 07-22-2014, 08:35 PM
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Oh damn that is a long time, check to see if there's any high resistance in the supply line between the battery supply and the glow plug module. Sometimes corrosion occurs in the module and makes them heat up very slowly.
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Old 07-22-2014, 08:51 PM
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but how would that explain why im not getting any juice to the plugs, id figure corrosion would let some juice flow through
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Old 07-22-2014, 09:16 PM
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From the glow plug control module relay there is a green wire that is a fusible link that's a 14 gauge. Make sure it's not broken. To be specific, pin 4 on the controller is an orange wire, that goes to the left bank of glow plugs, then the green 14 gauge fusible link goes to the right side glow plugs. This is just the power supply. Easiest way to test it, see if you have power coming out of the glow plug controller on pin 4. No power there when button pressed, probably a bad controller.
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Old 07-22-2014, 09:32 PM
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i just checked the plugs again and found out that ive been checking them wrong i was checking the wires for juice and not the plug itself (thank god for hynes) and while i was out there the ground wire by the battery was broken from where i had to crimp it due to a repair i had to make because of rats. Ill fix it tomorrow misquotes are horrible right now. I think its an 8 gauge wire.
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Old 07-23-2014, 09:29 AM
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Fixed the ground wire and still heating up slow if any
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Old 07-23-2014, 09:36 AM
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Fusible link isstill good
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Old 07-23-2014, 09:54 AM
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checked the orange wire and there was no power to it but i traced it and it went to the top of the alternator, the alternator shouldnt have anything to do with the plugs i dont think. I also noticed that something else plugged in to the alternator beside the orange wire, whats supposed to go there i couldnt find anything that plugged there.
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Old 07-23-2014, 09:58 AM
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I just thought about this, could it be the relay? Ive been calling it the controller thinking the previous owner replaced the original controller with a more modern one replacing the bullet style controller.
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Old 07-23-2014, 07:57 PM
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Quote:
Originally Posted by 1984F2506.9 View Post
I just thought about this, could it be the relay? Ive been calling it the controller thinking the previous owner replaced the original controller with a more modern one replacing the bullet style controller.
Relay is on the passenger fender, close to the starter relay. Usually down on the inner-fender. Controller (on an early 6.9) is on the back of the block. Controller tells the relay when to turn on and when to turn off. So if you have power to your controller, try the relay. It's a cheap part to replace anyway.
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Old 07-23-2014, 08:29 PM
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Ya it is, i dont have the controller i thought the previous owner put in a newer style controller but he didnt he bypassed it all together and i can hear the relay click when i push the button to warm the plugs up. I think its the passenger side battery because its gone bad im gonna replace it tomorrow and see if it helps any.
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Old 07-23-2014, 08:36 PM
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Quote:
Originally Posted by 1984F2506.9 View Post
Ya it is, i dont have the controller i thought the previous owner put in a newer style controller but he didnt he bypassed it all together and i can hear the relay click when i push the button to warm the plugs up. I think its the passenger side battery because its gone bad im gonna replace it tomorrow and see if it helps any.
Just my opinion, but it's doubtful that a different battery will make any difference in the glow plug operation. If your batteries have enough juice to turn over your engine at a decent rate, then they have enough power to power the glow plugs. The GP's take a lot less power than the starter does anyway.

If the P.O. bypassed the original controller, how are the glow plugs hooked up then? Does power to them still go through the controller? Technically you can hook them directly up to the cold side of a relay so they get full battery power when the relay is jumped with a button, and they'll work. But that is dependent on whether you have 12v plugs or the 6 volt plugs.

Also, if you want to do a push-button the right way, you can get a 7.3 style controller and wire it up with a push button and never have to worry about anything with your plugs again. The 6.9 style controller is a "fail open" style, so if it goes bad, the glow plugs will get full battery power until they burn out. The 7.3 is a "fail closed" controller and it will just stop supplying power to the plugs if it goes bad.
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Old 07-23-2014, 08:36 PM
 
 
 
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