30 year old boat has probably had more then a few changes. TB4 is fine, hope you have replaced that 3M scotch lock --- they BAD on marine stuff.Please tell me more about the Two Wire Thunderbolt Distributor Sensor...
I'm not familiar with that particular issue, and I'm not sure if it applies to my set up.
This boat originally came with a TB5, but was apparently converted to TB4.
Here is the previous thread discussing that discovery and mystery:
Strange Previous Owner Hack Job..?
Attempting to resurrect 1996 SeaRay 175 BRXL with 4.3LX Gen+ engine (S/N: 0F803561). All new outdrive seals, impeller, gimbal bearing, bellows, shift cable, battery, fluids, etc. Unknown history. Preparing for a lake trial this week. It runs really well on the garden hose. But I just noticed an...forums.iboats.com
The TB sensor was another problem child. 7 upgrades. The important one was adding a big ground wire. If you already have the big black wire that goes to one of the two engine ground studs on the flywheel cover, you're good. If you want the latest and greatest. P/N 892150K02