My dw423 variable sander quit while still new and was told to bypass some wiring anyone know what to do

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Not many spares are listed

https://www.google.com/search?q=WEN+7%22+2+SPEED+SANDER+MODEL+943+parts

Try the maker direct.

Parts - WEN Products

https://wenproducts.com > collections > parts
8.5-inch Sanding Pad for WEN 6369 Part Number: 6369-003 Compatible with the following Model: WEN 6369 Variable Speed 5-Amp Drywall Sander .

Try this link:
https://www.ereplacementparts.com/dewalt-dw423-type-inch-evs-random-orbit-sander-parts-c-1009_2742_2758.html

I would love to know where to find some drive shafts for this product as well!!! the porter cable drive shafts are not the same.

It sounds to me that you have used the sander a lot and the vibration has broken a wire or it's about to break on the field windings. The brushes you need to look at to see if worn. But I kind of think wire problem. I had this happen on mine and opened it up to find this is what happened. The sander would be turned on and would not operate until I turn upside down and it would work. This is great if you are sanding upside down but this is just a sign that you are on borrowed time as this will eventually not turn on at all. I was able to fix mine with new wire crimp connection and solder with heat shrink material. If not you can order new field winding if this is what is wrong. Cleaning up the sander won't hurt either. You might want to see what a new sander will cost vs. part. Good Luck!

trigger switch is probably bad or wire has broken or come lose,obtain parts list from sears to change trigger switch,or see if it is still under warranty.

depending on the model there might be a problem with a rubber belt from the motor to the rear roller or the gears are damaged, if you provide that I can look at a breakdown and try and come up with some numbers for you. Let me know

I have the same sander and found Black and Decker 93mm x 190mm sheets fit well

Checked the net for answers and got a couple of maybe's. 1.) Brushes, 2.) variable speed control, which some were direct wiring.
I tried the brushes firs and that has solved the problem for now. I guess the brushes stuck or somehow lost contact.
I got a parts diagram and found the brushes (will be covered with dust). Took the springs out and stretched them a little, replaced and the sander turned on. You will need to remove the top cover to do this. Verdit is still out as to long term performance. Not a great start.

My particular sander was lightly used (second project) and it has not been abused.

it may be the security system but i don't know how to bypass it. most security systems only prevent the original radio from being played if stolen from your car. but wouldn't affect a new radio. you may have to call a local dealer and ask them. the only other thing i can think of is when installing the new radio, you unhooked a wire or cut a wrong wire. good luck

It is either a bearing or bearings that are failing and causing the sander to slow down or the variable speed switch is failing.