I have a murray riding mower that I have replaced the solinoid and the starting switch but I still get no power to the starter. I can hot wire the starter and it will crank so there must be a problem somewher in the wires??

Check to see if there is a disconnect switch on the seat. Many machines will stop when you get off the seat. Also many machines must be in neutral before they can be started,

Could Be A Safety Switch Not Working, You Say When You Hot Wire The Starter , Do You Mean Making Contact Directly To The Starter Hot Wire Connection? If So You Have By Passed The Safety Switches. There May Be A Bad Ground Where The Solenoid Mounts, Or Check To See If The Fuse Is Blown.
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Thanks, Mowerman2468

Save yourself some agony and follow the directions do not skip one because "you have already done it" humor me and you will see the light.

You will need a volt meter and set it to DC volts
-Check the battery for 12.5 Volts
-Check the cables attached to the battery for the same voltage checking for good connections
-Attach the positive side of the volt meter to the + side of the battery and the negative side to the engine block, Still got 12 Volts? If not the ground from battery is bad.

-Now keep the ground on the negative side of battery
-follow positive cable to the solenoid and hook volt meter on the cable going TO the starter coming from the opposite side of the solenoid.
Turn key to "start" position you should have 12 + volts

YES-Check the same way on the starter motor where the cable FROM solenoid connects, If less or no voltage then cables or connections bad, If good voltage then starter is bad

NO- Take positive lead from volt meter to small wire going to solenoid and test for 12 Volts with key in the "start" position, If no voltage to small wire safety switch is telling it not to crank or ignition switch is bad (rare) If it does have voltage the solenoid needs replacing (common)

Hope it helps,
.Don