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08 convertible
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374 Posts
... figured it was the battery...replaced the battery...still nothing...replaced the starter and alternator...still wont start.
If you haven't figured this out by now, replacing parts at random is more expensive than paying the dealer $100 to diagnose the problem for you.
You need to stop thinking in terms of "what else can I replace" and start troubleshooting the system starting with the wiring as Indy suggested. You have a good start in that you know it will run with an external booster. Start monitoring voltages and see what drops where when you disconnect the external booster. Also check ground connections, measure cable resistances, etc. etc.
 
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