[jlex]

Have you ever replaced the ground strap? The starter on my '88 would about 20% of the time not respond to turning the key. Would always start when I tried the key again. Thought it was the starter or ign switch going bad. Just for the heck of it I replaced the ground strap (underneath the car). Hasn't had a single hang up since! Starters require a good voltage flow. Solved my problem for less than $10. Of course, if the battery isn't producing in the first place, there's your problem; ground strap will help w/ delivery only, not produce more voltage for you.