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  #1  
Old 09-25-2012, 05:12 PM
430bird60 430bird60 is offline
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Default testing clock

Anyone have any information on bench testing the clocks on our birds? Thanks.
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Old 09-25-2012, 06:41 PM
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DKheld DKheld is offline
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Basically the clocks have a spring loaded arm driving the clock motor at a constant speed. That way the clock doesn't loose time as the voltage to it increases or decreases.

It's easiest to remove the clock to test and oil it. There is an inline fuse holder behind the clock.

When 12v is applied to the clock the points make contact, energizes a relay and flings the arm around to start the clock movement. This will happen about once every minute and half. The main problem is that the points get corroded and don't pass voltage to activate the relay. That's why you can sometimes thump the clock and make it start. The other problem is the ground inside the clock gets corroded or looses it's tension and doesn't make good contact.

You can use emory cloth or something similar to clean the points in the clock - they make a tool called a "burnishing tool" to clean points. There are many light oils out there for clock movements. I use a mix of 3 different ones for my clocks. Use very very small amounts.

On the ground you can just re-bend them, clean and make sure they are aligned - then you should be good to go. Notice the case ground has 2 points to rub on the clock ground to make good contact - as you drive the vibration helps keep the contacts clean. That's what grounds the clock case to the chassis. Need to be sure the dash fascia is also grounded to the chassis.

Eric

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Old 09-25-2012, 07:47 PM
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Dakota Boy Dakota Boy is offline
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I had mine hooked to a 12v lawnmower battery while I was getting it to fire up.

It was really neat to see it working again.
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Old 09-26-2012, 01:55 AM
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As a side note, you guys with '55 Fords (with 6-volt POS ground systems):
Because the clock is really a spring-operated device, your clock may be connected to 12-volts and/or neg ground. No alteration is necesssary.

When the armature rewinds the spring, it also opens the contacts which disconnects electrical power. The higher voltage simply pulls the armature slightly faster but not more often. The contacts remain open until the clock spring winds down and restarts the cycle again.

I'm with Eric regarding the clock's ground. We tend to take that half of the circuit for granted but a thin layer of paint can disconnect the clock from ground.
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