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Dcraig:
The 123 and 124 CCUs are very similar but not interchangable. Ken300D's fix should work on either one though if that's what's wrong.
IMHO the best/easiest way to check if your aux pump is working is to unplug it and test it with a direct feed from the battery but others here may have other suggestions.
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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold
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