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96 E300D
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817 Posts
Discussion Starter · #1 ·
My 77 has the upgraded pencil glow plug and original relay. Recently the glow plug light wouldn't come on unless the starter is engaged. The relay isn't providing juice to the plugs when the key is in "glow" position but if you take the relay out then the car won't start. Any ideas on what is going on here? Also can't hear the relay trying to click in glowing position and I have tried unhooking the temp sensor so the relay would think it is very cold out, no dice.
 

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Registered
96 E300D
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817 Posts
Discussion Starter · #3 ·
I figured out the problem. I looked at my Haynes electrical diagram and saw where the juice came from. Check the plug to the relay and no juice on #4 plug. Checked the fuse box for juice and found fuse #14 is blown. Rechecked the diagram and saw that the input came off off this fuse. Replaced and I am good.
 

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'78 240D 4-speed greasel
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312 Posts
Nice, I remember staring at the wiring diagram for a long time when i updated mine to the pencil type...

but i installed the whole update kit
 
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