Most likely you will not see any difference. If you are maxing out the output of the present alternator there may be some advantage otherwise all that will happen is the battery may get recharged just a bit faster the with the 63 amp. One the battery has reached the voltage regulator cur off voltage the 100 amp will not produce any more amperage than the present 63 amp unit.
There are a couple downsides. One that has already been mentioned here is the need for a larger wire from the alternator to the starter solenoid. When IH released 2+2 tractors with 100 amp alternator they uses two 10 gauge wires connected in parallel for this. The other downside is the alternator itself. It is easy to build the alternator to produce 100 amps but if it allowed to run at that level for any length of time the alternator will have over heating problems. Delco Remy used a 12 SI unit to overcome the excessive heat problem. Most of the components will interchange with the 10 SI but a different fan and housings are used t get more air flow through the alternator.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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