carnut222 https://ozvolvo.org/discussion/comment/217271#Comment_217271
One thing I found when I converted my 79 245 to LH2.4 using a complete 93 harness is the ignition switch pin-outs are different for the early and late (I think 1990-later) ignition switch. So after I did the conversion, I discovered I had no power to the ECU (or EZK - can't recall) when cranking (or maybe when the ignition was in the on position but not cranking). Once I figured that out and swapped the correct late ignition switch in, the car fired right up. Not saying it has anythign to do with your problem but it might for some reason. In theory all should be OK as the 91 and 93 use the same ignition switch.
Hmm, interesting. I haven’t checked ignition power to the EZK yet.
I was checking continuity of the constant power wire from fuse #6 to the EZK, when I discovered that I also have continuity to ground.
I disconnected the EZK, ECU and 24 pin connector to isolate the engine loom from the dash loom. Checked the red constant power wires in engine loom, no short to ground. Checked the red constant power wires in the dash loom and had continuity to ground.
Unless I’m misunderstood, I have a short to ground somewhere in the dash loom, which I haven’t touched other than soldering on the pins for the 24 pin connector.
This wagon was running 12 months ago before I pulled the engine, so I know there were no prior issues. I visually inspected the dash loom where is runs out and along the firewall to the drivers side of the engine bay, in case I’d crushed the loom when dropping the engine but there isn’t any visible damage.
I feel I’m going deeper and deeper into this rabbit hole and over complication the **** out of it.
PS: Fuse #6 isn’t blown, I don’t know how the loom hasn’t caught on fire and popped fuses with power shorted to ground.