Hi all,
I replaced my old motor with a new B&S and it runs terrific. I literally rebuilt much of the mower including the deck. As soon as I move the deck engagement lever it stalls out. I check the switch behind the dash for the lever and my multimeter is beeping on both sides of the switch so it does not seem to be the switch. The switch is hooked up with a solid connector. The seat switch is brand new and is functioning because when I get up from the seat the mower shuts down. I am completely stumped. Any ideas? 

So is it electrical or binding at the deck?

Hi,
Definitely electrical. I rebuilt the entire deck and is spins like a top. As soon as I move the deck lever 1/4" to engage it shuts down. 
Thank you,
JIm

Ok, sounds like it’s on the grounding side since it allows you to start with no problems. I’m guessing it works fine if you disconnect kill wire from ignition coil?

Mikel1
Ok, sounds like it’s on the grounding side since it allows you to start with no problems. I’m guessing it works fine if you disconnect kill wire from ignition coil?  
 
I will try that but the motor is brand new. When I removed the belt from the engine pulley and move the engagement level still it stalls. If it not the kill wire any other ideas? 
 
Thank you Mike!
 
Jim
 

Removing the kill switch wire should keep it from shutting mower off from a faulty switch.

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I replaced a 33R877-0009-G1 with a new 33S877-0019-G1 on a pp19a42 and I think I found the issue.
The old wiring from the motor had 5 out of 6 of the electric pins on the connector in use. The new engine connector only has 4 of the pins in use so I think this is the issue. The white white coming from my harness has nothing to connect to.  
 
Harness connector -> motor connector
1 solid black and 1 white striped black wire -> solid black wire
2 blue wires -> Gray wire
1 blue wire -> red
white wire -> nothing
 
I have images if needed.
 
Thank 
Mike

That could be it. Do you know where the white wire went to the pin engine connector and where it went?

This white wire appears to go to safety switch on deck engagement lever under dash which is probably why it is stalling when I move the lever. It runs down to the 6 pin plug but connects to nothing. I don't have the old motor for reference.