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W140 Coupe Not Starting/Cranking

walshy66

New Member
Joined
Jul 5, 2011
Messages
12
Location
Clitheroe
Car
W211 E270 CDi
Hi, hope you can shed some light on my problem.
I know the problem is electrically based due to a bit of research, but hit a brick wall.
All dash ignition illuminates but won't crank over unless I put a 12v POS(+) to the starter solenoid feed, then she fires up as normal.
I'm lead to believe this 12v+ is sourced via Neutral Switch / K38 Relay etc but I have no idea where K38 relay is (all sorts of different suggestions), how to check Neutral Isolate Switch etc.
Some ideas of process of elimination would help, how to get to a starting point , ignition switch removal and check etc.
Are there any test points along the way?
As I said if I apply 12v+ to starter solenoid she starts no problem
Its a 1993 S500 Coupe
Thanks in Anticipation
 

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