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post #1 of 3 Old 04-02-2019, 06:15 PM Thread Starter
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glow plug relay questions

I have an '81 w123 240d and the glow plug relay is bad. I have one from a '84 300sd,they are very similar and I'm wondering if I can use it in the 240d. If you are holding either relay in your hand with the strip fuse on the bottom the 4 prong connection just above the strip fuse is the same on both. Just above that are 4 more metal prongs that are the same on both relays. On the very top of the 300sd one there is a metal prong on the right and a plastic one on the left. On the very top of the 240d one there is only a plastic prong on the right on no metal prong. If I break the top plastic prong from the 300sd relay, I could plug the male connector into the 300sd relay.Would that work? The connection for the 5th glow plug would be connected to nothing. Also, has anyone bypassed the relay with a button switch and heavy duty relay such as a starter solenoid? If so , how would you make the connections between the power supply and the plug connectors? Finally can I take the bad relay apart and fix it it? Thanks for any advice.
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post #2 of 3 Old 04-04-2019, 12:11 PM
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I believe this is the part in question.

If so I would put a new one in. The one from the 84 300sd is a different part and most likely will not work.
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post #3 of 3 Old 04-19-2019, 08:24 AM
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Look up the part number for your car on their site. They will tell you if it is correct or not.
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