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#1
12-21-2008, 07:04 PM
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Glow Plug Indicator Light Out
I have a 1983 300D, glow plug indicator light not lighting upon turn of key. Does this indicate a glow plug out or is it just a fuse or bulb??
__________________
 1983 300D 292,000 miles2002 VW Jetta TDI 153,000 miles Got Diesel????? 
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#2
12-21-2008, 07:15 PM
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First check the bulb. If the bulb is OK, it is either a defective relay or the relay is telling yopu that you have one or more glow plugs out. Check the glow plugs with an ohmmeter. Each should measure less than one (1) ohm. Replace bad glow plugs as necessary. If the glow plugs are all good, then the relay may have failed.
Are you having problems starting the car?
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
12-21-2008, 07:22 PM
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On mine, it was an indication of a failed gp, I tested with an ohm meter, and found the bad one.
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83 SD 84 CD
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#4
12-21-2008, 07:24 PM
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How do I go about checking the bulb? I really am having no trouble starting it, plug it in when it is too cold out and it starts as good as can be expected for wintertime
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1983 300D 292,000 miles2002 VW Jetta TDI 153,000 miles Got Diesel?????
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#5
12-21-2008, 07:38 PM
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Also, is there anyone nearby in Ct area that can help me that has an ohmeter and would be willing to check the glow plugs for me?
__________________
1983 300D 292,000 miles2002 VW Jetta TDI 153,000 miles Got Diesel?????
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#6
12-21-2008, 08:28 PM
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Pull the instrument cluster, lots of threads here describe how. Then pull the lower-right-most bulb (in a socket with a wire pair coming out) and remove the bulb. Test with an ohmmeter or replace with a known good bulb.
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"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#7
12-21-2008, 08:40 PM
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Quote:
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#8
12-22-2008, 09:28 AM
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Bulb would be the last thing I'd check. Ohm meter on the glow plugs would be first. Not only is it a whole lot more likely that it's a glow plug problem, but it's also a whole lot easier to check.
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Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#9
12-22-2008, 09:53 AM
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i accidentally discovered when troubleshooting glowplugs last time in my 85td when the light quit coming on, that if i left the connector to the plugs from the gp relay unplugged and then turned the key to glow, that the dash light would come on and go off real quick. Dont know why its like that, but may be an easier way to test the bulb than pulling the cluster
__________________
 1996 E300 110,000 1985 300TD 212,000 1980 300D 238,000
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#10
12-22-2008, 10:22 AM
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Quote:
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