Merc4ever
Petty Officer 1st Class
- Joined
- Feb 14, 2009
- Messages
- 232
Most of us know the Thunderbolt V has a purple wire that needs to be grounded to set the timing in order to stop the auto advance. But what about the Thunderbolt IV on a 4.3 Mercruiser? I'm trying to time it right now and can't find how to put it into base timing mode. The Mercruiser Service Manual doesn't mention it in the timing section and I know there is no purple wire to ground on the Thunderbolt IV.