Doesn't light up when the black and red are reversed either.... I tested off the odd lead as well... Nada.... I'll have to get a new LED the next time I'm in the city....
Dad just bought an OBD2 scanner. Would that work to check from the port under the dash by any chance??

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All it takes for evil to prevail is for good men to stand by and do nothing.

Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic