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Old 03-25-2002, 05:48 PM
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sixto sixto is offline
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
First, search the archives. This has been discussed several times.

Sounds like a good time to buy a shop manual. This will be a long installation if you have to trade emails to find specific wires.

Crutchfield sells an item called a DLSV. It's a wiring harness adapter that has sockets for two common relays and taps into the MB door lock vacuum pump. I think the part number is 514DLSV but the system doesn't recognize it. Try calling them. This <$5 item will save you a lot of time.

Folks who've wired W124s for keyless entry say that some systems don't provide a signal for long enough for the vacuum pump to react. If you system has an adjustable door lock/unlock signal, set it for the longer time period.

91 300SE
86 300SDL (due soon)
81 300SD (for sale cheap)
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