Go to your computer in engine compartment. take apart where the electrical harness enters the computer. take some dialectric contact cleaner and generously spray the contacts. additionally take a toothbrush and clean contact areas on the computer and the wire harness. if truck doeesnt start then try the obvious, bad starter or bendix or both. starter relay (should be located on fire wall). had the same problem at had a bad starter as well as the cmptr contacts/wire hareness needed cleaned. hope this helps.
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