The glow plug relay is inside the left front fender , it's a black plastic rectangular box with two wires connected to it , one is unfused battery current , the other one connects to the series wired glow plugs .
In your year Mercedes , if *one* glow plug burns out and goes open circuit , the rest stop working and the car becomes very difficult to start .
Replace all , not just one , if you find a dead one .
DO NOT use Kragen , Autozone , Pep Boys etc. champion or autolite glow plugs ! they're often bad right out of the box .
-Nate
Rodger Asked :
>
> Hello All
>
> In my 1978 300D the glow plugs are powered after the light goes off.
> I think they are in parallel a circuit so they may be the faster plugs.
>
> How long should they stay on?
>
> If I am using my ohm meter correctly there are zero ohms resistance on the plugs. I will have a friend check the resistance. in case I am wrong.
>
> Could the plugs staying on cause the plugs to burn out and have no resistance? (the car will not start)
>
> Where is the glow plug relay? I looked at pictures on ebay but can not find it.
>
> thank you
> Rodger
>
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