Starting issues

I recently install a new alternater in my 1988 s10 4.3L 4x4 auto. I couldn't get to fix the truck for about 6 months. In that time the truck just sat. I
charged the battery and trying to start the truck. I'm getting power but the truck won't turn over. The starter didn't even click. Thinking that the starter was bad I removed it and tested it using jumpers from the battery. It seems to work fine. Not being very good with ignition systems what could I check next? I did cycle the gear lever through the detents and I tried it again, no joy. I figure that a switch has gone bad but how do I isolate the problem? Thanks- Stan
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Could be the starter neutral switch.....try bypassing it and see if it starts. But make sure it really is in park with the emergency brake on.
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If it's a late 88;
Look under the battery tray, and see if there is a plastic box with the positive battery cable running into it. The alternator wire going back to the alternator, and another large wire (about 8 gauge) running to the power distribution box on the left fender skirt.
If there is, there is a very good chance that the battery cable has oxidised inside the rubber covering the crimp, on the connector.
To isolate that area, try removing the battery, using quality booster cables. Jump to the engine for ground, and the bottom of the mega-fuse.
This is only if the vehicle is a late 88 and equipped as mentioned above.
Otherwise, check your battery cables under the plastic covers on the battery end.
You might have an acid caused corrosion problem in that area.
Good luck.
RK

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