"Do the 1990 240’s have the infamous 25 amp fuse on one of the inner fenders ..."
Yes, they do. The fuse holder and its wiring are what makes this infamous; I've not seen one conclusive report that the fuse itself has been defective aside from oxidation on the terminals inside the holder. http://cleanflametrap.com/emfuse.html
The way I rule these out is to check for battery voltage at the AMM with key on engine stalled. This check provides the assurance the fuse wiring, FI relay (system portion) and its distribution is functional under load. You can't do that with a DMM on the wiring itself either with power-off continuity checks or power-on voltage checks.

On a '90, check the orange wire going into the AMM for battery voltage with key on, engine not running. Proves the fuse wiring is good. This will work with LH2.4 and LH3.1.
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Art Benstein near Baltimore
I went to buy some camouflage trousers the other day but I couldn't find any.
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