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Old 11-20-2013, 05:24 PM
Zacharias's Avatar
Not so amused
 
Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
Preglow relay interchange: w201 to w123?

I have been having some possible relay issues (another thread) and I just found my spare preglow relay... which turns out to be for a 190d, based on my check of the part number (005 545 18 32).

Two questions:
- any impediment to using it?
- did the 190d system have a post-glow function built in (relay stays activated and plugs hot for a while after startup)? If so, for how long?

Thanks

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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Old 11-20-2013, 05:38 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,807
If the relay has 5 pins in the smaller connector, it's an afterglow relay. The fifth pin, actually marked pin 6 since space 5 is blank, is for a coolant temp sensor. Afterglow time is determined primarily by coolant temp. FWIW, preglow indicator time is more dependent on engine temp than in a conventional relay. If you restart a hot engine, you might not notice the preglow indicator come on because it'll go off very quickly even if the plugs are still energized. I don't know if preglow cycle time varies with engine temp or is different from the maximum cycle time of a conventional relay.

If it fits, try it.

Sixto
87 300D
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  #3  
Old 11-20-2013, 05:41 PM
Zacharias's Avatar
Not so amused
 
Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
It's four live pins on the small plug. Thanks for the quick reply.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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