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I bought the Mercury CDM Test Harness made by CDI Electronics. This is the one that goes between the CDM (coil module) and the wire harness that plugs into it. It gives pigtails for the 4 wires so you can measure voltages while cranking/running (with CDM still connected) using a DVA as...

Hi Gang. I got my new-to-me '00 Challenger 2000 with the Mercury 240 efi (gen1, round cover) a week ago. I bought it non-running. Last ran 2 years ago but wouldn't rev up past about 1/2 throttle as the story goes. Seller was right. It starts and runs great... throttle seems normal up till...

The starboard head temperature switch (as labeled in the service manual wiring diagram) is the top sensor in the pic with only the single wire connector. This is an overheat "switch" in that at the set designed temperature, the sender grounds the single wire connector. This Tan/LtBlu wire then...