Could be the starter but also very likely is the starter relay. I do
not know whats used in your Isuzu though. On my '93 Nissan truck the
relay was in the fuse box under the hood where most larger fuses, relays
You may also look at the battery cables for corrosion. Even if the
terminals look ok lift up the insulation of the cable a bit. See if
there is corrosion between the wire strands. It often creeps all the
way down under the insulation with very little visible.
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