They are the same as the Welman 070 12v plugs. Overly advanced injection timing, leaky injectors, or running gasoline in your engine will cause the combustion temperature in the pre-chamber to get hot enough to damage glow plug tips. New glow plugs for the Chevy 6. Most common: the indicator light bulb in the dash is either bad or not making good contact. They are used in 24v systems. The plugs you bought are not true 24v plugs. Measure conductivity to any glow plug on the right passenger's side of the engine.
I had a lot of problems getting the socket at the right angle because there is a metal heat shield directly under the glow plugs getting in the way of the wrench. I had started a few times in warm weather without cycling the glow plugs. On my 98 the passenger side is the difficult side because there's lots of stuff in the way. If the plugs are connected to the 24v terminal block, yes you will need the big resistor. What you have is known as a 'manual glow plug override. Try to simulate what the glow plug controller would do.
Using a heavy jumper wire ~ 10 , apply power to the glow plug stud for a few seconds. Some say to replace all the glow plugs if you find one bad one. They are the same as the Welman 070 12v plugs. In fact when I was working on the front plug I dropped it down the heat shield and couldn't find it for over an hour. Attach the multi-meter to the glow plug lead.
Now you say it wasn't on the truck. The engine just got harder and harder to start and wouldn't start once the temperature got below 50. Remove the injector, stuff the pre combustion chamber outlet port with some kind of cloth that you can pull out in one piece with a pair of pliers. Install glow plugs in each cylinder head Tighten plugs to 8-12 lb-ft. The relay is in circuit with the ignition switch and is energized only when the switch is in the Start and Run positions.
The are not wear items like spark plugs, and can last the life of the engine if they are not abused by a defective glow plug controller. Some aftermarket high output alternators can produce excessive voltage also. The glow plug controller functions basically like a relay, but with some computer control. Removing and replacing the controller is really easy and doesn't require removal of the engine cover. Remove the lead from the glow plug.
Check current at each glow plug. Current reading should be 50-55 amps at each bank when cycling. Strange problems can occur if the terminal nut is loose. The reason we are able to use the 12v plugs is due to the big resister on the firewall being part of the circuit. If ambient temperature is over about 22 C, or 72 F, your truck should start regardless of whether the glow plugs are working or not. Also will i need that or the card i fried to run the push button.
How would i go about putting one on? Also will i need that or the card i fried to run the push button. . It should be present, even with the ignition off. Over voltage can be caused by voltage regulator problems in the alternator. The reason we are able to use the 12v plugs is due to the big resister on the firewall being part of the circuit. Momentarily test the meter connections by grounding to another point the second test lead. If current is zero at both locations, check fuses and circuit for shorts, grounds, opens.
It is a dark colored box, about the shape of a large deck of cards. It explains the function of the resistor. How to make glow plug switch manual operated. Since the center core is a stronger material than the plug casing it will be difficult to have the drill stay in the center. Almost always the pink is 'ignition feed'. The plugs you bought are not true 24v plugs.
You want to add a manual switch but have no idea how because you don't know if you need to replace the card. The wiring diagrams are located in the Appendix F of the -20 and and Appendix E of the -34 manuals. The glow controller itself is still self- regulated, and will come on if the temperature falls below a certain threshold, and won't if it thinks the engine hot enough to start. I would replace all the plugs if you find a bad one and you have 50,000 or more miles on the engine. Remove the nut holding the ring connector with the wires going to the glowplugs. Test them first with an ohm meter, should shouw a very low resistance reading. If you hook them up to the 12v terminal block, no you do not need the resistor.
The glow plug controller serves as the main power connector for the Hummer's electrical system! Perform steps 5 through 8 on the remaining seven glow plugs. Momentarily test the meter connections by grounding to another point the second test lead. Sometimes the tips of older plugs get damaged swelled up from the heat and can't be easily removed from the cylinder head. If there is an open no conductivity, high resistance then one or both of the main glow plug controller output fusible links has failed. Remove all glow plug connectors at the glow plugs.