Further investigation regarding fitting air conditioning to a 410 has made me think about the current draw that this adds - around 15 Amps. While an uprated alternator will easily provide the extra current, the ammeter and its original wiring were not designed with this load in mind.
Conversion to LED headlamps should lessen the load enough to prevent this becoming a problem. Otherwise I suggest wiring the air conditioning so that it disables the heated rear screen when in use. It is unlikely that both would be needed at the same time.
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