1988 420SEL ABS light comes on within 5 minutes from initial startup, and ABS doesn't function.

I seached old threads and found info suggesting to clean the sensors and check for a tired fuse.

I removed all four wheels and sprayed brake cleaner everywhere, no luck. I checked the fuse box, but I don't see a fuse labeled ABS, unless its somewhere else, or I'm missing something?

This has been going on for about a week or two, so I think if it were the alternator not generating enough power for the ABS to work, then the light would probably come on right away. Additionaly, I have no other electrical problems and the battery charges fine.

Any suggestions? Thanks in advance.

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2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

SOLD:
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino