Quote:
Originally Posted by minniecamper
Thanks Bob. How did you determine it was a bad switch
|
I'm willing to go out on a limb and guess on how this works----but do keep in mind that I've never looked at that specific switch!
This is the way it is done in many cases.
When we have a DC motor that is wired to extend orretract things, it is often a motor that runs one direction when power is put on in one polarity and runs in the other direction if that battery and ground are reversed.
There are different shapes and styles of this switch but the same general methods, so if we learn to recognize the idea, we can sometimes guess which wire is where to test.
There are often two lugs that have connections to battery and ground. When we push the switch one way, that battery and ground are connected to a set of lugs that go to control the motor and if we push the other way the wiring makes the motor go in reverse!
If we think of what you were finding and it worked one way but not the other, you know that the battery and ground were getting to the switch and through one set of contacts to the motor as it worked but not when we needed to use the other contacts.
So a bad switch or possibly a wire broken off from that set of contacts to the motor!
Like the switch on a ceiling fan?
If you've ever build a model railroad, you may see that as the old familiar "reversing switch" to make the train go in different directions!