Notice that the ignition light on my Mk2 S occasionally flickers at higher road (not engine) speeds, typically >50MPH. None of the alternator leads seem loose, so I am guessing that something loosens intermittently with the volume of air running through the grille. Any other likely explanation? If not, which is likely to be the offending lead? Maybe a dirty connection?

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1970 Cooper S SPO41

The light flickering can be a warning that the brushes are wearing out.
One wears faster than the other but you replace as a set.
These are mounted external on an S, easy to replace in situ.
Otherwise, probably a bad connection somewhere.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Dr Mini, will check for bad connection first

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1970 Cooper S SPO41

If it turns out to be brushes, the only supplier I can see is Minisport (SA) with their ABR5406/ULB110- Lucas Alternator brush set. Is this what I would need for a Mk2 Alternator?

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1970 Cooper S SPO41

For parts for 15AC alternators:

Try Anthony Buttigieg trading as "Auto Electrics on Wheels" and listed in Ausmini businesses. He supplies a lot of mini related electrics as parts or complete units and is very willing to discuss problems.
[email protected]
0408 731 441
Or (07) 5546 9065

Also check Ashdown Ingram Brush Set 9815 ( may not be still available)

Also check Elecrical Rebuilders Group QLD (07) 3277 9377 ( speak to Allen Hill) for parts or rebuilds.

Thanks Bill B

Sent from my SM-A305YN using Tapatalk

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1970 Cooper S SPO41