Re: '02 GC Overland start/turn signal problems
I don┤t think that these two problems are related. The turn signal problem is most of the time a loose solder on the combination flasher relay board. You could take the relay out, open it and check the solders and re-solder any which shows cracking or other signs of bad contact. If that doesn┤t help, you probably need a new combination flasher relay. (this relay is mounted on the junction block under the steering wheel area), or the switch stalk.
Regarding the bad starting, check all electrical connections first: battery poles to be clean from corrosion, starter motor electrical wire connectors and the ground wire to the body. Could indeed be that the starter is going bad.