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Gothmog1065
May 14, 2009
Hey all, I'm trying to find the load drop on my Big Dog Alpha MP zero turn. The basic issue I'm seeing is the starter is turning, but it's not engaging the engine. So basic research shows that there may be a large amount of voltage drop that may be happening, and I'm just testing to see if that is indeed the case. However, when I start testing, I'm getting voltage where I shouldn't be.
Video I'm using is here: https://www.youtube.com/watch?v=Ixe0hkcl6dw
First I look to test the positive side through the solenoid to see if there are any major drops there. So I throw the positive lead on the battery, and put the negative lead on the contact bolt where the wire from the solenoid attaches to the starter, and I get a voltage of 12v. From what I'm seeing, I should get 0 until the key is engaged.

Same thing happens in reverse. I put the positive lead on the starter case, and the negative lead on the negative battery terminal, and I get a voltage reading. Nothing that I know of has been touched in terms of the electrical system, no work has been done since I last used the mower.
Shorting out the solenoid has the same effect, the starter spins but the engine won't engage.

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