Lamp 2 (Red) On

If test light illuminates during one of the following tests, stop test and eliminate cause of problem. Check the following:

Battery insufficiently charged.
Excessive voltage drop on ground terminals for control unit or relay for control unit including plug connections.
Break or excessive contact resistance in ground wire to control unit terminal No. 10.
Excessive contact resistance or open in ground connection on electronic relay.

NOTE: All test procedures correspond with program switch position numbers on the Bosch ABS Tester. See Figure .