Posted by KEB1 on April 02, 2011 at 16:43:15 from (97.124.137.47):
In Reply to: 1 more glow plug idea posted by Fordman6442 on April 02, 2011 at 10:34:36:
I have a B275 which uses the same glow plug system. I replaced the glow plugs a couple years ago, and its still working just fine. Takes about 10 - 20 seconds for the indicator to start to glow on 12 volts. If its glowing faster on 12 volts, you still have a problem with the glow plugs or a short in the wiring somewhere.
There is NOT an extra resistor between the common terminal on the ammeter and the glow plug indicator. The glow plug system is intended to work directly off 12 volts.
Are you absolutely certain you have the glow plugs themselves wired right? Do you know if the plugs are getting hot? If the indicator is getting way too hot too quick, there has to be a short somewhere, or you have the wrong indicator.
Start at the top of the glow plug closest to the indicator (the rear of the engine). The lug from the wire to the indicator should be directly under the thumbscrew, then a metal cap, then a ceramic insulator about 1/4" thick, then the wire to the next glow plug. The next plug should have two wires, one to each adjacent glow plug, separated by the 1/4" thick ceramic insulator, and so one for the other two plugs.
Do you have a voltmeter? If so, connect it between the top lug of the rearmost glow plug (the terminal that connects to the glow plug indicator) and ground, then turn on the glow plugs. What does it read?
I just went out and checked mine. With the indicator glowing, there is about 4.5 volts between the glow plug terminal fed by the indicator and ground. If yours shows something less, either one or more glow plugs are shorted or or they're wired wrong, or they're the wrong glow plugs.
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