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I have 13AC762F755 - Yard-Man sometimes it will run for a while with blade engaged. Other times it dies immediately. Without blades engaged mower runs strong. Help needed. Thanks in advance

Very important.
Manual PTO or Electric PTO

Manual has lever on right side of seat

clean underside of deck & inspect blades

Deck is clear ,new blades, new spindles blades spin free . it dies even if I engage it on pavement when its acting up I did connected reverse safety switch n mowed once but that was because its an intermittent problem

the pto safety switch is a double switch. one wire is red or orange and the other wire is yellow. follow the yellow wire, it may have a nick in it that is grounding the ignition. follow it up to the seat switch as this may be where the issue is.

Where is that switch located

Is there a way to bypass all the safety switches to see if the switches are the problem for sure

For the purpose of TESTING only you can disconnect he magneto cut out wire at the plug located near the starter motor.
However this is the same wire that turns the engine off so you should not mow like this as it is very dangerious.
To stop the mower you will need to ground that wire.

However you already know the problem is in the wiring.
All of the safety switches that cut out the engine are ground connections.
Connected in pairs
Seat + PTO
Seat + Brake
PTO + gear
and gear/ lap bars + Brake

Each pair acts independantly from the other pairs.

OK I will look at wiring tomorrow to see if any bare wires grounding out

So I pulled the big plug by started died immediately plug it back in an unplugged 2 wire connector it ran for 20 mins died and won't start at all

Well if I have no idea which wires are what I would chase them back to see what they were connected to before I start disconnecting stuff willy nilly.
Take the blower housing off and follow the thin wire on the coil.

I pulled the black wire ran to magneto. It ran fine for a while no deck engagement problem . now it seems after it runs for about 30 mins it stalls and won't start again until it sits for about an hr. What does that point towards bad magneto?

You got it.
The module inside the magneto is failing when it get hot.
When it cools down ( 30 minutes) it will work again.
Double check by testing for a spark at the plug when the mower cuts out with that wire still disconnected.
Also check the engine side of that wire.
In running mode, brake off, bum in seat PTO turned on the wire should be open .
Bum off seat Pto on and the wire should go ground
As per the previous post.