rumor has it that LarryT wrote: > BTW, I searched for a DMM that reads dc > current to 30a or so and no one had them. I'll order one though.
DMM can be hard to read the slope, or change over time. The current draw starts high, then drops back a bit as the plug warms up. My favorite way to test them is with an old add-a-gauge-under-the-dash-style ammeter. I had a +- 40A in my parts box. On a OM616 or OM617 with parallel plugs, I unplug the glow plugs from the relay. This seperates the plugs - they now each have there own wire. I then connect the ammeter between batter positive and each of the glowplug contacts in the connector. It's quick and easy to see if they all act the same. I don't know how this method will adapt to a newer engine, but the meter should work the same. I know Summit Racing sells an ammeter by itself. I believe AutoZone does too. -- Philip
