Quote:
Originally Posted by Junkman
........... I also swapped in another used glow relay since it was handy and easy. No change in the light and I did get close to battery voltage at the glow plugs. There was some voltage drop in the wiring but I don't remember exactly how much.
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You should get not much higher than 11 volts at the glow plugs when they are powered up. Anything higher means one or more glow plug is not drawing full current. I would not trust an ohm meter measurement of a glow plug. An easy way to check if your glow plugs are all working is measure the current consumption with a clamp on ammeter. With 5 good glow plugs, it should surge to 100 amps and then steadily drop to around 80 amps when they are full hot (after around 10 seconds).
I bought my HF compression test set about 5 years ago. It worked ok at first but with more use, the readings got more and more inconsistent and would not hold. I did some leak testing and found the quick couplers do not seal well and leaks down. I replaced the quick coupler at the cyl head end with better and smaller quick fitting, eliminated the quick fitting at the gauge end, and it's been working great (does not leak down) ever since. Basically the only HF parts I kept was the bare gauge and the ends that screws into the head, and made it much quicker to use. I can take a compression reading in cyl's #1 thru 4 via the glow plug holes in less than 5 minutes each. # 5 takes longer.