If the voltage at the starter solenoid is lower than 12-13.8 V when the key is turned to start, the problem can be fixed with a relay installed inline with the starter circuit.
This common problem occurs when the starter wiring connections and key swiitch lose conductance due to age and corrosion.
Here is a do-it-yourself fix link:
clicky starter self fix and headlight relay - Zukikrawlers
The fix involves a common automotive relay (show your auto parts store counter guy the relay pinout in the above link. If he gives you a stupid look, go to another auto parts store), a 20-30 amp fuse with inline holder, some 18 gage automotive wire, 4 - 1/4" spade connectors, a ring connector (for the ground connection) and an electrical splice unit.
(Note: Merlin93 rightly pointed out via a PM that the fuse should not be so large that it'll never blow... You might be able to get away with an even smaller fuse than 20-amps - the worse that could happen is that it will burn out. If it does frequently "pop", double check the wiring before using a larger fuse. If in doubt, just buy a kit as described below.)
Most Suzuki offroad vendors also sell the complete kit for 15-20 bucks (US) plus shiping.
The following article from izook.com describes the installation of a Clicky Starter kit:
Clicky Starter Quick Fix Kit For Samurai | iZook - Suzuki 4x4 Tech Information, Accessories, Travel & Adventure
I am not sure if the vendor mentioned in the izook article is still in business as this article is more than 5 years old...
I hope that this helps!
searchable links to the Samurai/TracKick
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