$@#% clock!

[ThePhoenix]

I just replaced the diodes in the clock on my '83 300SD and tested it with 12vDC from a battery charger on the bench and it held excellent time for over five hours. Put it back in the car and... nothing. Tested power to it, getting 12v... WTH?

[Justin_P]

I'd be interested if anyone has any insight into this, too. I replaced the capacitor in the clock of my w124 and found the exact same thing - it worked fine when tested, only to once again barely keep time when back in the car.

[ThePhoenix]

Originally Posted by Justin_P

I'd be interested if anyone has any insight into this, too. I replaced the capacitor in the clock of my w124 and found the exact same thing - it worked fine when tested, only to once again barely keep time when back in the car.

I assume you meant 'capacitors' (plural)? Did you also use a power supply other than a battery when you tested it? Just curious.

[Justin_P]

Nope I meant capacitor, there is apparently only a single one in the clock of that era (1991). From memory I tested it using a battery, not a power supply.

[ThePhoenix]

Originally Posted by Justin_P

Nope I meant capacitor, there is apparently only a single one in the clock of that era (1991). From memory I tested it using a battery, not a power supply.

Oh I see... I guess it's time to pull it back out and start over.

[pmckechnie]

Don't forget, the ground is just as important as the +12 V.
Paul

[ThePhoenix]

Originally Posted by pmckechnie

Don't forget, the ground is just as important as the +12 V.
Paul

I saw that in another thread and I have an auxiliary ground wire going straight to the chassis.