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Old 06-30-2010, 10:41 AM
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Glow plug light on dash very dim, 1992 300D 2.5 turbo

1992 mercedes 2.5 turbo glow plug light on dash very dim car will not start.

Model: 300D 2.5 turbo
Chassis: W124.128
Years: 1990-1993
Engine: OM602.962 I5

Last edited by whunter; 06-30-2010 at 11:09 AM. Reason: tech data
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Old 06-30-2010, 12:04 PM
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Electrical difficulties (FIRST How's Your BATTERY???)

If you still have your ORIGINAL Pre-Glow Relay ,There's no 80 Amp fuse,The
Relay is Electronically enabled to "SEE" "Shorts" and disengage.

A Dim bulb indicates a weak battery or a bad (Partial) connection.


1.With your DMM (Multimeter) [Usually on SALE @ Sears or Harbor Freight]
Measure the Voltage @ the RED (Insulated) single wire at the Glow Relay
[your Glow Relay is mounted on the Driver's Wheel house,front]The RED wire
has BATTERY Voltage (AKA HOT at All Times)

2.Be VERY Diligent in your inspections and find the Pre-Glow Ground wire.
Test it for Continuity.Make sure all it's connections are "Clean,Bright and Tight"

You'll need these instructions (Below) for "Visuals" of what we're talking

You'll note the Dash (I.C.) Pre-Glow Light is on the 4 Prong plug for the Relay
(Marked "LA")

All this is just for "Openers" [But,you could always "Get Lucky" and find it above.
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Glow plug light on dash very dim, 1992 300D 2.5 turbo-screenhunter_07-jun.-30-11.59.gif  
'84 300SD sold
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