Many thanks to you all for your replies!I have been to see the dealer who is good with advice ,he seems to think it will be a sensor problem, just clean not replace.I hope he is right as a new sensor is £100!!!The over voltage relay is only £40 so if the problem persists it maybe worth a try now I know where it is!The light did not come on today whilst I was driving but it came on whilst my wife was so it maybe just her imagination(wishful thinking!).The OVR definetly has a replaceable fuse,yes?
Again thanks.
Hamish

Where exactly are the wheel sensors? I have been getting the ABS light also.

__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

Also had the ABS light come on on the 560SL. It was one of the front wheel wires going from the inner wheel well to the sensor at the rotor. Due to the flexing of the wire while steering the internal wire had failed.

Dave

__________________
1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

how exactly did you find out that that was the problem, and what did you do to fix it...did you change the whole wire? chop out the bad section and splice in something new? just change the terminal?

I’m not sure how real this is, or if it’s quantifiable, but I seem to notice that more often than not the ABS light comes on in the morning. Basically it always comes on when leave for work, but in the evening, when I drive home it almost never comes on. How is that even remotely possible? I’m going to be changing my front brake pads tomorrow morning so I’ll take advantage of the downed car to clean the ABS sensors and check the electrical leads to them.

At first I didn’t believe that the ABS was truly deactivated when that light was on. An intentional “emergency” stop at a relatively slow speed proved me wrong….and left a cloud of smoke rising. Just to be clear, when the ABS light is on…THE ABS SYSTEM WILL NOT FUNTION! I find that to be truly disturbing and frankly unacceptable. Not having ABS is not an option. I’ve gotta fix this electrical gremlin.

My ABS light has been coming on intermitentlyever since I changed to snows. I used the alloy rims from the C-Class to use on my 94 E320. This might be the cause as they fit but stick out a little because they weren't designed for this car. It will be interesting to see if the light comes on when I switch back to my regular wheels.

__________________
85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)