Quote:
Originally Posted by gregp1962
Thanks Math. I'll do that tomorrow. In '84 we have the newer type. I assume that a direct 12v will do it. I can say that when I turn on the plug relay when they are installed, the battery voltage drops about 1/2 volt. To me that says they are drawing amps.
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12 volts is fine on the pencil type Glow Plugs used on the 617 type engines.
What you want to see is the tip of the Glow Plug get yellow hot. If it gets hot in the middle as the one in this picture that plug is still no good.
When the Glow plugs are out you need to ream out the carbon build up. There is a special reamer for that or there is alternative methods like using a drill bit turned by hand. The end of the reamer is 7mm.
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You can't test the earlier individual filament/loop type glow plugs on the battery as it quickly buns up the filament.