Good idea, I'll check to see what's installed and probably replace all just for general purposes. Did that on my father's 126 420SEL and cleared up a couple of electrical gremlins that were plaguing that car.Before anything else, put in a full set of brandnew copper core ceramic fuses such as those made by Flosser. Do not use the plastic Chinese dogsh!t autoparts stores sell as you risk melting down your fusebox.
Starter engages. Earlier when it did this, I could get it to fire and run with a shot of starter fluid, so I replaced the fuel filter, and all was good for a month or two.Then determine if the starter engages. If it does, continue reading. If it doesn't, alarm module is probably acting up.
OK, will check that. Have a spare in another non-running car, but not sure if that one is good. Is there a test other than replace with a known good unit?Have you put in a brandnew OVP (either OE MB or KAE)? Without a good OVP, a HFM M104 will not run.
No CEL as the car doesn't start / run, and there wasn't one prior. I have cobbled together a flash code reader and did check and clear a bunch of codes before all this, when it would not start due to a clogged fuel filter. I'll check again and see what the new codes are.Any CEL?
Use the appropriate scan tool for the w124s, to see what codes, if any.