I looked up the numbers on my 107 CD for the 560SL and KOEO is supposed to be 75mA. Not sure what the 260 is.

The CD says that the EHA or its wiring, the ECU, or the "reference resistor" could cause the number to be off.

The test for the EHA is, with key off and EHA disconnected, 19.5 ohms resistance between Pins 1 and 2 on the EHA connector. As a last gasp, you can plug the EHA back in and test for the same resistance at Pins 10 and 12 at the ECU harness.

If that checks out. I would start looking for a brain. A good place is car-part.com. I found one for my 380 at Strandbergs in Wisconsin.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe