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I read the good news! 2.4V is really low.
Thank you for checking that ECU number and the starter wiring. I'm surprised to hear it has a cold start valve; I wonder what turns it on-- a thermo-time switch like on K-jet maybe?
Also, I checked my LH2.0 car. The cranking signal to the ECU is done with the yellow/blue from the ignition switch, so there is only one spade terminal on the starter (#50) in use. The ballast bypasser (#16) is unused, as it has no ballast resistor. So I was surprised to hear you have two lugs used. And Bruce mentioned chasing the brown wire from starter #16 back somewhere... Hmmm.
Is your coil on the driver's side or by the hood hinge on the passenger side? Here's what mine looks like on a k-jet car, with the ballast resistor in the foreground:

You can see the brown wires-- one to the coil and the other to #16 on the starter solenoid. The lower side of the ballast gets the key-on +12. But this car is three years older than yours and not LH-jet. I almost wonder if your B21F-LH has Bosch ignition - like this:
The Chrysler ignition module has a vacuum diaphragm on the side of it.
No need to dig up that AMM part number- I'm pretty sure of that one: -001.
And thanks again for helping with my LH1.0 learning.
--
Art Benstein near Baltimore
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