2000 f150 5.4liter wont start after replacing starter sylonoid
check all your connections and make sure that all ground wires are especially tight. then check the relay
Sounds like you have a battery issue. Put a volt meter on your battery. If it reads less than 12.5 volts, replace the battery. I take it that you turn the key and are hearing just a click?
is your security light flashing on your dash
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