Ticking Sound

[BRIAN123]

WHO: 1990 500SL , 107K
WHAT: ticking sound
WHEN: when engine is off, lasts a hour or so
WHERE: I think from ABS module
WHY:

[BDBENZ]

It sounds like it could be the OVP (Over voltage Protection) relay. It can cause the ABS unit to cycle when the key is off among other symptoms. Another symptom is high idle, your ABS light to come on dimly and maybe other weird symptoms. Good luck.

Bill