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  #1  
Old 12-06-2016, 07:10 PM
cuballis cuballis is offline
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Default Cub 86 wiring/charging help

My cub 86 had some electrical issues that resulted in me replacing the key switch and then I wasn't getting power to the key switch. The battery terminal of the key switch was coming from one side of the ammeter, there was power to the other side of the ammeter (with two wires) so I disconnected the ammeter and tied all three wires going to the ammeter together. This allowed power to the key switch, but now when the tractor is running my multimeter shows the battery has 6-7 volts, and 12 volts with the key off. I'm at a loss, any ideas?
Thanks.
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Old 12-06-2016, 07:21 PM
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Alvy Alvy is offline
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Im assuming with that voltage you have to jump it off to start? Your battery is not charging. Sounds like you need to replace the ammeter. Verify wiring connections are correct. Then look at second link. Battery volts while charging should be around mid 13's to low 14s volts. Get a volt meter and test light, they're really good tools to have

http://www.onlycubcadets.net/forum/showthread.php?t=22

http://onlycubcadets.net/forum/showthread.php?t=18
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Old 12-06-2016, 08:28 PM
cuballis cuballis is offline
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How do I bypass the ammeter? It was charging last week and then all of the sudden, no juice to the key switch. Replaced the key switch, still nothing. So I tied all three wires going to the amp gauge together and now it starts, but discharges while running. My volt meter shows 12 volts at the battery when the tractor and key are off. The volt meter shows 6-7 volts when running at full throttle (volt meter bounces around a lot). I'm guessing that one of the three wires I have tied together should be left off?
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Old 12-06-2016, 08:33 PM
cuballis cuballis is offline
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Looking at the diagram it looks like I need to disconnect the red wire from the solenoid to the ammeter (which was nave tied into the battery terminal of the key switch. That is an excellent diagram. Thanks!
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Old 12-06-2016, 08:39 PM
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Sam Mac Sam Mac is offline
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You said you replaced the key switch, did you buy the proper switch for your machine or did you pick up one from a place like Tractor Supply? Just because it said Cub Cadet on the bag does not mean it's the proper switch. Cub has a multitude of switches that are machine specific.
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Old 12-07-2016, 08:47 PM
cuballis cuballis is offline
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Should voltage pass through the ammeter? My ohm meter shows that a current won't pass through, do this mean I have a bad ammeter? I don't have another one to test to compare.
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Old 12-07-2016, 09:34 PM
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Voltage is the potential as read across the battery, Amperage is the flow of current (electrons) through a wire or and in this case your ammeter. Yes it should be able to pass current through it. When the current is flowing that's what moves the needle. If your Ohm meter shows the ammeter as an open, then it has failed. It should read continuity.
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Old 12-07-2016, 09:41 PM
cuballis cuballis is offline
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Thanks Diesel Doctor, with that knowledge I believe I have tracked down the problem.
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Old 12-12-2016, 11:26 PM
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Quote:
Originally Posted by cuballis View Post
Should voltage pass through the ammeter? My ohm meter shows that a current won't pass through, do this mean I have a bad ammeter? I don't have another one to test to compare.
So, not to put too fine a point on it, your ohmeter reads infinity between the two terminals, right? You have to disconnect one side or the other to properly ohm it out.

For what it's worth, my 147 had a bad ammeter - the glass was cracked and it had been sitting in a lawn tractor grave yard so it was corroded inside - it did something similar to what you are describing.
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