I kept reading about glow plugs and found some useful info like the power train control module powers the GPR and the GPL separately and that the PCM has to reprogram itself after the batteries are unhooked for more than five minutes and when replacing broken parts. I then applied common sense to that and that assured me that my wires were right and not wrong because I should have marked them when I unhooked them but got side tracked. So I think everything is fine with that but still have to go and try and start it up. Thanks, though because so far this site has been the most helpful to me as I am repairing vehichles for the first time.
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You have 4 wires, you have 4 lugs on the relay. It doesn't matter how they go on, except you have 2 big lugs and 2 small ones. Attaches the wires according to size, which side they go on doesn't matter. If you only have 1 small wire, it goes on the side marked "I" Ignition.
Hello try to measure the voltage at the glowplug wire with ignition on.
It must be at between 5 and 12 volts. They need to be changed at 60000 to 80000 km. Because at this mileage they are normaly burned out. Each plug can drag 8 to 10 amps, when on.
If no reading volts, the glow plug relay, and maybe the plugs must be renewed. There should also be a big fuse at the firewall, check that also. Follow the glow plug wire, where it goes to. Does the glow plug lamp light up in the dashboard ?? Are the relay clicking ???
Check also for blown fuses, resistors, or broken wires.
If you change the glowplugs, DO NOT overtighten them, not more than 15 NM !!!
not always the golw plugs can be bad and the engine can be low on compression. does it start alot better if you add a gallon of kerosene to 5 gals of desiel? Or a quaart of gas? the glow plugs can be checked with a test light the connectrs are in plain veiw and the wires going to them are big. Follow the wires back to the relay they go straight there, the relay is real close to the battery as it draws alot of power follow the big wire on the battery that doesn't go to the starter and thats the glow plug relay. they last good but the connections get dirty, reconnect all the connectors on itand see with the key on if the glow plug light comes on on the dash that wire that lights the light is the same wire that lights the light fires the glow plugs. You can take the wire off the glow plug( you need to do it anyway it's a yearly service anyway and with a test light connected to power touch the disconnected glow plug with the lights probe and the light should light, not all of them are likly to be bad but if you find two or more just change them all as the ones that aren't out are likly to fail anytime and if you want to drive though the winter you need all the help you can gt. the battery cables and the one going to the glow plug relay are likly to fail at the battery so go over this good It might start fine with just two glow plugs working I'd pick the two center cyclinders or the two outboard ones as once the engine starts it'll keep running long enough to start the other ones. low voltage as your cranking can effect the glow plugs but the relay is suposed to turn the glow plugs off at cranking and time out after they've been on long enough. dirty connections are almost always the problem so clean everthing before you replace anything. Needs cleaned before yu put on new parts anyway and the glow plugs need to be taken out with the right tool or you may end up with a broken off glow plug in your cyclinder head.
PULL EACH GLOW PLUG OUT TAKE A PAIR OF JUMPER CABLES TO IT CLIP RED ON THE PART WERE THE WIRE HOOKS UP THEN GROUND TO THE SIDE IF LIGHTS UP GOOD IF NOT BAD (BECAREFUL ITS HOT) IF ALL IS OK YOU HAVE A BAD RELAY
The diagram is simple each glow plug is connected in a series circuit like this -0-0-0-0-0-0-0 that's a in-line 6 for a V-8 it would look like this
and the plugs would be hooked up on the back then if you follow the wire to the glow plug relay you will find that the relay has four wires one to battery one to the glow plugs one to the ignition switch and one to ground in the box. If you want you can purchase a manual for 5.99 on-line. and it covers the three fuse-able links for this system and the new Glow plugs available for this truck here is the web page. http://www.wiring-diagram.com/?gclid=CMuAvJ3Ql58CFQZfagod0jpAxQ
You are looking for a bare spot on a wire. When the glow plugs are powered up the system is shorting out. Start tracing wires. Work back from the glow plugs to the relay. If its not there, you'll have to start tracing the wires from the relay to their destinations. When you find it, tape it up and reposition the wire so it won'trub again. Hope this helps.
If you are sure the glow plug relay and timer, which looks like a starter relay sitting on the intake manifold, are good. The glow plugs are located under the rocker arm covers between each injector. I would recommend purchasing new rocker cover gaskets, which incorporate the wiring harnesses for both glow plugs and injectors. They can be reused, but they will generally start to leak oil before long. The injectors are pretty easy to identify, they're the big square things with the electrical plug. the glow plugs have a single wire running to them. if I can recall they require a 10mm hex. hope this helps.