From: Mike (michael@tsixroads.com)
Date: Fri Dec 17 2004 - 22:50:42 PST
I have been working on my M1010 glow plugs and though I would share my results so far. It worked fine when I first got the truck but last winter it got were it wouldn't crank below about 45 degrees. I still had to cycle the glow plugs before it would crank below about 60 degrees so I knew at least a few plugs were still working. I checked a few of the easier to get to plugs and they were open to ground. I bought a set of 60g plugs, got ready for the worst and proceeded to change the plugs. Much to my surprise they all came out without any problem. None of them were swollen at all. Three were still good. It had WELLMAN 6A843G070 plugs in it. I got this truck from DRMO and it was unmodified. The relay (newer silver can type) was still connected to the resistors. Somehow I either lost or was shorted 2 plugs so I reused two of the old plugs. I also removed the wire from the resistors and put a jumper to the 12 volt buss. The first time I started it I got a big voltage drop on the front battery and it started but not any faster than before and it had been run earlier that day. That night it got down into the low 20's and had warmed up to about 35 the next morning when I tried to crank it. The wait light stayed on much longer than before 20 to 30 seconds and it wouldn't hit a lick. I barely got any voltage drop either. The batteries were a little weak so I charged them and tried again Thursday afternoon. Still the unusually long wait light and wouldn't crank. It was about 50 degrees then. I checked the same 3 easy to get to plugs and they were all still good. Next I checked the relay. It still makes a good clicking noise but I only got 0.5 volts from the load terminal. I guess either the extra load from 8 good plugs or the excessive time burnt out the contacts in the relay.
Next I plan to replace the relay. I am worried about the excessive time though. I may do a manual conversion, but haven't decided yet. Someone mentioned that the 60gs pull more current than the original plugs do. Has anyone actually measured the voltage at the resister to see if it is really 12 volts and if it is much different with 60g plugs verses stock plugs?
Mike
Tishomingo, MS
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