Hi I have a 1985 Dodge 350 crew cab and the problem is the dam thing won't start. I changed the alternator , voltage regulator, the fuseable link. I can jump the truck using a scrwedriver but it won't start the key. This has got me totally buffaloed. Any help would be great

Check the ign. Switch go to the switch make sure there is power going in . The norm is a red wire or yellow and thick. If there is power going in try to cranl the engine and check to see if there is power any where at the switch it would help if you go to the starter and see what color the wire is at the starter sol. If the is power going out then run a new wire to the starter