Toyota Repair: 4runner Starter Problem, neutral safety switch, starter solenoid

Question
I think I'm having the Intermittent starter problem you have heard alot about.  I have a '91 4runner V6 and I've replaced the starter twice and I'm still getting the clicking when I try to start, It usually only happens after I drive for awhile and then come back to it after it sits a few minutes.  I was hoping you could e-mail me your starter relay diagram, I have experience in electrical systems so hopefully I will not have a problem doing this myself.  Also I have an aftermarket alarm that I installed (3+  years installing mobile electronics) and I was wondering if this will cause any problems for me installing the extra relay? Last thing, would the neutral safety switch have anything to do with this? My email address is JandM402@msn.com

Answer
I'm not so sure the extra relay will solve the problem because you can hear a clicking noise which means the starter solenoid is engaging but the starter won't spin, make sure that the cables from the battery are good and the ground cable to the body and engine are clean and tight.I have forewarded a copy of the diagram via email.