Looks to me like a "Surepower" Isolator for charging dual batteries from a single alternator. They were popular back in the 1980's. I still have one here in the shed, has yours been blue in colour originally? Voltage loss was a bit of issue with one I had, from 14.2 volts at the alternator it dropped back to 13.5 v after the isolator.
I ended up removing mine and making my own manual system that just used relays.
Cheers, Mick.
1974 S3 88 Holden 186.
1971 S2A 88
1971 S2A 109 6 cyl. tray back.
1964 S2A 88 "Starfire Four" engine!
1972 S3 88 x 2
1959 S2 88 ARN 111-014
1959 S2 88 ARN 111-556
1988 Perentie 110 FFR ARN 48-728 steering now KLR PAS!
REMLR 88
1969 BSA Bantam B175
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