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Originally Posted by tcane
Snipped for brevity
Test procedure for loop-style plugs (old style): disconnect ground wire on glow plug for #1 cylinder, connect positive probe for volt meter to positive terminal #5 plug (centre threaded portion) and negative probe to ground - if you have 12 volts then one of the plugs is bad, if you get 0 volts then either fuse is bad, defective preglow timer relay or activation relay.
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Good Luck!
Tom
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Hi all.
I got this far and have 0 volts to the #4 (1978 240D) GP. The fuse is good. The GP relay under the steering column clicks sometimes. Someone has taken it apart in the past. The internal contacts on the large relay were badly pitted so I cleaned them up as well as I could.
I re-installed the relay and still get no GP light and 0 volts to the fuse and the #4 GP.
What next? Is the relay bad? What and where is the preglow timer relay?
Everything worked fine until during a warm start the GP light flashed on for a second or two and then stopped working altogether.
Dropout