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Old 09-20-2013, 06:01 PM
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deniss deniss is offline
'84 300SD W126/OM617
 
Join Date: Apr 2006
Location: Central NJ, USA
Posts: 452
Quote:
Originally Posted by funola View Post
Power the glow plugs with the battery and observe the glow. If it gets yellow red hot at the tip it's good. I use glow plugs till they burn out, that's the time I replace them
Yes they did show that glowing bright orange color when powered from the battery. Took them about 2-3 seconds to get to that state.

Quote:
Originally Posted by funola View Post
Yes I understand. The glow plugs stay hot for quite a while after they are powered and their resistance go up, drawing less current. That's why the first gp you test shows lowest battery voltage and last gp highest battery voltage.
Ah, now I understand what you meant -- good point!
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84 300SD - bought in April '06 with 237,000 mi
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