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Several possibilities: 1 - The ammeter was wired wrong. In the process of messing with the coil wiring you inadvertantly corrected the wiring error. 2 - There had been an open circuit to the alternator #2 (voltage sense) aux terminal. Again while working with the coil wiring it's now properly connected. 3 - If you've still got the original 20-0-20 ammeter and the battery was partially discharged briefly, the pegged ammeter merely is indicating the battery is being being charged as it should. (A 10SI can throw 50 amps or more into a low battery - that'll peg a 20 amp ammeter HARD!) 4 - (Long shot...) a current-carrying wire inside the ammeter box ran had been routed close to the ammeter case - which will mess the ammeter reading. Suggestion: Use a good DC voltmeter and take a reading across the battery posts after the engine has run a couple minutes. The voltmeter should indicate in the range of about 13.8 and 14.5 volts. Higher that 14.5 volts says the battery is being overcharged.
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