[NCSERVICE]

thats a pretty crude wire diagram however, i would check the fuse, check the key switch, and how did you test the altenator?

 

[NCSERVICE]

amps depend on the manf of the engine, and the model. if you have good voltage comming off the alt then you need to chase that red wire and see if you have power at the end of it, then continue on till you find the fault. this is all based on the assumtion that you have load tested your battery to tell if it is good, put a multi meter on the battery with the unit running and check the voltage there.