Hi, The truck was running good, we shut it off and the next time we went to use, (NO SPARK) we messed with the wires near the alternator, cleaning connecxtions ect. it started once. We shut it down to to replace the breather and it did not start again. Is there anything to check? switches sensors or anything like that, the ground is good and battery is strong, it cranks good anyway. Or anything else to look for? Thanks.

 

try cheking for sprk coming from the coil...most likely the coil.