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track short circuit?
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[quote]QUOTE: <i>Originally posted by howmus</i> <br /><br />[quote]QUOTE: <i>Originally posted by bukwrm</i> <br /> <br />When you switched polarity on the power pack and the voltage droped to 3 volts from 9 the only thing that changed in your circuit was inside the power pack. My guess is high resistance on one terminal on the polarity switch inside the power pack. Does the power pack geet very hot if you leave it in the position with the low voltage? Try another power pack if this is happening. <br /> <br />[/quote] <br /> <br />Since the same thing is probably occurring when he switches polarity with the Atlas Controller, that would elliminate the power pack in my thoughts. Jockellis, take the loco off the tracks (all locos and other equipment that draws power to the track) and check the voltage to the tracks. Then switch polarity in the pack. If the voltage drops, it is the pack, if not, it is the loco. What I'm thinking is that the brushes in the motor may be binding. I have had that happen. <br />[/quote] <br /> <br />You are right, I was thinking of my set up, currently the power pack is the only control I have. If you set everything so you get good voltage at the track. Switch polarity at the Atlas Controler, go bak to the original settings then switch polarity at the switch on the power pack. If the voltage drops both ways then the problem is somewhere else but if it drops with only one switch than you have found the problem. <br /> <br />I had not even thought about the brushes flipping when the motor reverses. Good thought. I think I have spent to many years installing parts.
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