AMPs required to run 12VDC dash clock?

[Geneman]

Trying to run Porsche dash clock off of 120 converter.

Anyone know? Thank you!

[MBAtarga]

I'd expect a couple hundred mA max.

[Geneman]

thank you!

[ChrisHoover]

Connect an ammeter in series with a battery and the clock and measure the draw. Or measure the clocks resistance and do the math

[70SATMan]

https://www.vdo-instruments.com/media/instructions/TU00-0755-0000002%20Cockpit%20Int'l%20Analog%20Clock%20Data% 20Sheet.pdf

Probably in this ballpark.

[Wayne 962]

So, depending upon the year, the older clocks (like the ones on a 356) have a coil in there that winds a mechanical mechanism. This then winds down for about 5-10 minutes. When it gets to the bottom, it closes an electrical contact and zip - winds it up again. I have one inside of an old piston on my desk - powered by a AA battery. It can last for months like this.

The newer ones are a bit different, but they still draw almost next to nothing...

-Wayne

[Geneman]

Wayne. I just made two of the piston clocks for my brothers for Christmas gifts!! Had one from a 77 and 88 911 they fit perfectly into an older 914 cylinder I was grateful to get from MEpstein here.
like all of us, I had literally dozens of those plug in transformers that go to every conceivable gadget... I just wired them up....work perfectly! 12 v , 1 amp. BTW those VDO clocks are some of the most accurate movements I have ever seen .

[thsupernge]

We need pics

[PCA7GGR]

I had an aftermarket alarm installed on my ‘73 911. It would go off for no apparent reason. To the alarm installed quite a bit of diagnosing to figure out that the clock drawing current was the culprit.

He put some gizmo on the clock to solve the issue. Unfortunately, the clock became unreliable. Replaced it with a newer clock.

[Geneman]

here ya go... love this (originally posted by another pelican!)

[RDM]

An SC clock takes about 1/10 of an amp intermittently.

[Coblue]

I need a working clock.:/

[theiceman]

im pretty sure last time i did a parasitic drain test the battery was drawing about 12-15 ma or so and the clock was the only thing drawing power...
..