Thanks for letting me know I should buy a tool that costs half of what I have in the entire project. If it's really this simple I shouldn't need a tool to know how to reset the alarm and trace issues with the immobilizer.

I'd love a wiring diagram if I could find one. Unfortunately I can't.

Why was I working in the column with power on the car? I wasn't. I josseled all kinds of crusty home made starter wiring, from the PO, while removing it then powered it up. I don't even know if that 50A fuse on the K40 relay blew then but the lead to the starter was definitely not in good condition and may have shorted.

If it has 6v when it's powered on I agree that is odd. It maintained 6v while cranking. So yes that could be a short if it does in fact need 12v rather than 6.

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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap