Wire it the same as when you had the generator, of course you have to lose the external regulator. The output of your alternator goes directly to your amp meter. Remember the amp meter is there only to measure the charge/discharge rate of your battery, nothing else. As noted above, an alternator is capable of produceing much more current than a generator thus you can/will peg the needle in a discharged state. One can do several things to solve the problem. One is to use a shunt in parallel with the meter. Getting the meter to read correctly is an issue left to an electronics guy. The othe way, again noted above, is to replace the amp meter with a volt meter. If you convert to a volt meter the wiring changes somewhat.