'95 5.7 TBI Starting Issue

[special-K]

Twice before my '95 K2500 Suburban has failed to start. Both times it was wet out, so I suspected it was time for a new cap and rotor.

I had noticed it was cranking longer, especially when cold, and take a while to smooth out. The first time it didn't start I had just reached inside and didn't crank it quite long enough to catch. I climbed in and it just cranked. The next day was dry and it started. Weeks later it happened again, and it was wet again, started once the weather dried up again.

Yesterday it had rained overnight and half way through the day. I went to start the truck and it tried but didn't fire up. Really seemed like it was moisture in the cap so I put the new cap and rotor in. and they both looked good and ready. No carbon tracks but plenty of sooty stuff inside the cap and the rotor as well as contacts being very played out. Now with new cap and rotor it only cranks, never tries to fire at all. Now I'm not sure if moisture wasn't just a coincidence.

I checked spark from the coil and nothing, so I assume I do have fuel but no spark. I've never had to service a TBI with EFI. In an older truck I'd be putting a new coil in, but I know there is more to it on these. There is power to the coil at the fat pink wire. Is the small pink wire connection going out of the coil also a constant 12v with key turned on? I get nothing there (with 'in' plug connected). Does that mean the coil is bad or is there more to it?