Solenoid would buzz when attempting to start. Battery reads 12.6 volts at ready and 12.3 when start button is pushed. Selenoid tested good. Removed starter it was seized. Replaced starter still no start. Jumped selenoid still no start
Could not find any blown fuses. Tested voltage at each component to check for voltage drop they all read over 12 volts at ready and when ignition switch is pressed. Is there a ground somewhere I'm missing? An issue somewhere at the ignition switch? Would appreciate any suggestions.

Edit: when I run a jumper cable from the positive side of the selenoid to frame starter engages.

 

"when I run a jumper cable from the positive side of the selenoid to frame starter engages." Impossible, unless you have wired the earth lead from battery onto starter live post, and if you have now run a positive to earth, the starter would run backwards and you may have blown a load of electronic components. Not sure about the old 420, but Honda have a habit of wiring the earth lead to a starter mounting bolt. The seized starter is very common on 420s, old and new. Honda chose a very cheap and nasty starter motor for them, magnets drop off and jam armature.

 

nope running leads straight from the positive side of the selenoid to the frame. Starter turns over. One would think the problem would then lie between the ignition switch and the fuse box being I just bypassed that part of the circuit. Just not sure what to look for unless I missed something else. That's why I'm on here...for help. Uploaded a picture of where I'm placing the jumpers to. I tried uploading a video but could not get it to upload.

 

I run the jumper wires from the positive side of the selenoid to the frame of the atv and it turns over. One would think the problem would lie between the ignition switch and the fuse box since I just bypassed that part of the circuit. Just not sure what to look for or I missed something else that's why I'm on here....for help. Here's a picture of where the leads are placed.

 

As I wrote before, that should not not make the starter work, your jumper wire should melt. As it hasn't, you have not got an earth from the battery to the frame or engine, and if the starter is running it seems you have connected what should be the earth (negative) battery lead to the "live" post on starter. In doing this you have also connected the whole bikes electrical system backwards without the fuses being able to blow, so may destroy the electronics, regulator, ECU, digital display etc.

 

Thanks for the.... "help"