On the ground connection (W1) in a 1990 190E 2.6 which one of the 4 connections agianst the firewall is for the vacuum supply pump?
I ran some tests to find out what a device on central locking is draining the battery. I found a bad ground wire.

Going to left to right there is four of them on the fire wall and by looking at the ground distribution diagram a lot of devices are grounded there coming to a total of 42 wires. It would be much appreciated if someone on here which one of the four it was on.
It will save alot of time.

Much appreciated

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)