Barry,
Could it be that by the time the voltage gets to the socket there is enough
of a drop in the voltage to not power the LED's?  Bad ground maybe?  The 2
tests I would do is take the 1157 and hook it up the battery, is it bright
then being in the socket?  Then take a voltmeter and measure the voltage at
the socket and the battery, are they the same?  If I remember correctly,
LED's are a step voltage item, there must be a minimum voltage to operate
whereas lamps just look dim.  I figure you have done all of this but you
never know.
Let us know the results
Regards
David Templeton
'59 Triumph TR3a
'74 Triumph Spitfire
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