Thread: 603- Will It Hurt Anything To Use An Afterglow Relay With An Early Glow Plug Harness?
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Old 10-22-2014, 04:10 PM
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Hit Man X Hit Man X is offline
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I have a W140 after glow relay on my SDL's original harness, no problems after many miles. All I remember doing was swapping the relay and adding a wire to a sender. Sorry, it has been nearly 10 years since I did the modification.

Really smooths out the cold start of the 603
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I'm not a doctor, but I'll have a look.

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