PeachParts Mercedes-Benz Forum - View Single Post

lrg · #2 06-09-2005, 02:58 AM

On the later cars the GP relay is in the engine compartment on the driver's side wheel well and probably the same or close with your car. If it's working you should be able to hear a "click" when you turn the key to the glow position. If you are getting full power to the glow plugs when you leave the drivers door open at night you should see the interior light dim when you glow. If no "click" or no noticable light diming then it's probably a relay or low voltage problem. Also, are you sure you are getting fuel? If you have an air bubble in the fuel line you can crank all you want and it won't necessarily start. Lastly, if you have the early loop type glow plug setup ALL the plugs need to work to get proper glow on even a few cylinders. Do a search here and you'll find lots more info on troubleshooting the loop type system.