Ok
X27 is a jumper point we use to test the starter, but the E500 has it some where else and the CD does not show it. They show it next to reservoir, but it is not there and I forget where it is on that model [ someone?]

Anyway, here are a few test for no crank:
First, turn on the headlamps and then attempt to crank...do the headlamps go out or severly dim?

If yes , you have a bad connection feed or bad battery voltage.
Next, try 'N" instead of P...Turn the key with left hand and hold it in the start position as you try the gearshfit lever around the N gate position..if yes , then you have a bad NSS. [ Neutral Saftey Switch]

Next is to take out fuse 5 , I don't care what you think about the fuse, replace it. That feeds the K38 relay and if it has a bad/poor connection, the K38 drops out of the circuit and you have your conditon. That is starter interlock for ATA Alarm system.

Try those first.......

__________________
A Dalton