4.3 Ignition swap

[fbriggs]

Have a 1997 Star Craft with a 4.3 (262) GM. It has a failed ICM and as you know N A. from Merc. My question is has anyone had this problem and just swapped out the Thunderbolt IV ignition system and replaced with a good HEI Distributor. Doesn't seem to much sh is uld go wrong. Please if you see this not working for some reason. Would love to hear your opinion. To me it's just old school and simple. Saving hundreds of dollars.
Thanks ahead of time
Fred Briggs

 

[alldodge]

Replace with Delco EST and go boating

 

[Scott06]

Agreed Delco est is the way to go unless you can find a good used module on Ebay etc

 

[Scott06]

A quick ebay search shows TB 4 modules (are you sure its a 4 ? would think a 97 would be a 5) $200-400.

https://www.ebay.com/sch/i.html?_nkw=mercruiser+thunder+bolt+4+igntion+module&_sacat=0&_from=R40&_trksid=p2332490.m570.l1313

Obviously depends on the exact module. But would keep it stock and eliminate the minor wiring mods to do the est.

 

[Scott Danforth]

97 should be TB5 as it was introduced in 96

 

[nola mike]

97 should be TB5 as it was introduced in 96

But should be able to use either