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  #1  
Old 12-27-2009, 02:48 PM
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1983 300sd glow plug relay location

A friend of mine has the above mentioned car. He said that it is not starting and he is trying to find the glow plug relay among all of the other relays. How can he identify which one is for the glow plugs? Is their a numbe or even better yet a picture? Thank you so much.

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Old 12-27-2009, 03:11 PM
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Follow the wires from the glow plugs back to the relay.
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  #3  
Old 12-27-2009, 03:22 PM
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Thanks, so I can assume the relay is under the hood then? This is not my car and I'm talking to a friend about it away from the car so it makes things a little more difficult.
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  #4  
Old 12-27-2009, 03:28 PM
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On the drivers side inner fender.
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1983 300sd glow plug relay location-gp-relay-126.jpg  
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  #5  
Old 12-27-2009, 03:33 PM
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It's under the hood, on the front edge of the left wheel well, next to the oil cooler (the skinny radiator next to the real radiator).

It is all black plastic, about 2" wide x 4" long by 4" tall, with a snap-on cover. Remove the cover to test the fuse (the little aluminum strip); remove both phillips screws and hold it in your hand. Do not just visually inspect it and determine that it's good. The fuses are about $0.45 at places which carry MB parts.

http://www.buymbparts.biz/ShopByVehicle.epc?q=1983-Mercedes--benz-300sd-Body--Electrical&yearid=1983%40%401983&makeid=63%40%40Mercedes%2DBenz&modelid=6207%3AMBC%7C1510%3AED%7C10000134%40%40300SD&catid=241959%40%40Body+Electrical&subcatid=242005@@Preglow+Time+Relay&mode=PA
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  #6  
Old 12-27-2009, 04:21 PM
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See Diesel Giant for easy glow troubleshooting. The relay may be good but the plug bad. You only need a volt meter to diagnose.
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Old 12-27-2009, 04:36 PM
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Quote:
Originally Posted by Junkman View Post
See Diesel Giant for easy glow troubleshooting. The relay may be good but the plug bad. You only need a volt meter to diagnose.
Ohm meter also.
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Old 12-27-2009, 06:42 PM
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Is that the entirety of the glow control system, or is the timer somewhere else?
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  #9  
Old 12-27-2009, 07:15 PM
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Timer is part of the relay. Relay makes an audible click when it times out. Relay is energized from the ignition switch. Relay switches main power to the GPs. Main power comes from the battery to the terminal strip in the right fenderwell, then over to the GP relay contacts and on to the GPs. When the relay is energized, you should see 12V at the tips. Just a tiny bit of resistance in the path from the battery through the relay contacts to the glow plugs can affect GP operation. Engine ground strap can affect GP operation too, but that would probably also affect the starter.

Reason you pull the fuse out to inspect is that it can crack in the middle.
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Old 12-27-2009, 08:01 PM
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Ok, just wanted to make sure I had everything before the car goes away.

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