Thunderbolt5

[a.d.mobile]

looking for diagnosis for thunderbolt 5 ingnition module. the module will not go to base time there is a manual supplement from merc 90-823224941 per bulliton 94-2 1994 7.4 brovo 1. The module sell's for 300.00 and I would like to make sure something else is not causing module to flake out like bad wiring?? maybee supplement is online??<br /><br />Thanks..<br />P.s I did ground the purple white wire before starting the engine.