sounds like a dead battery to me....
even though the cables are tight, they still corrode and loose conductivity.
remove the cables and clean them and the posts. also check the selenoid end and the ground end..
if thats not it, then the other options would be a new battery or maybe the alternator is shot...
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91 LX 'work in progress'
previous stangs;
lightly modded 84GT
81 2.3 converted to 302 auto
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