My honda wont start;sit for a few days,find out da battery was low recharge and alternator bad replaced too and start its good but still nothing

If the alternator recently went out, there is a good chance you blew the fusable ink to your alternator. Look under the hood for your under-hood fuse box. One of them will be marked alternator, charging, or system electrical. It is a 30A plastic fuse (I think, it could be 50). It will be marked by the top side of the fuse box, there should be a fuse map on the plastic box holding the fuses. Check these with a DMM (or visual check works I guess). If one of them is bad, this is your problem. The car will not charge the battery of the fuse is blown.

Jump start the car and measure with a voltmeter the voltage accross the battery. It should read 13.7 volts or greater with the engine running.if it doesn't it's the alternator or the voltage regulator. If it reads normal 13.7 or greater then measure the voltage accross the battery with the engine off. It should be 12 volts or slightly higher. If those readings are nominal then there is something that is drawing oower when the car is turned off, could be a light or some other short in the electrical system. If you have anything connected to AUX power make sure the voltage is zero volts with the engine off..