Reverse light won’t work

So I replaced all my taillight bulbs to led bulbs because the passenger reverse light was out come to find out it still doesn’t work tried different bulb and nothing brake and turn Signals work just wondering has anybody had this issue? Don’t have a multimeter yet so I can’t test for current

 

Was the driver side working before hand?
After led, driver side also not working?
Try putting standard bulb back in?

Automatic, bad safety neutral switch
Manual, bad reverse switch

 

Yes I tried this and nothing thanks tough

 

Driver side reverse was and is working I haven’t tried standard bulb I just bought this truck about a month ago it was out when I bought it thought it was just a bulb but seems to be more than that

 

Time to pony up and buy a Meter !!!

Corroded socket or broken wires most likely

A 1/2" fitting brush works great for cleaning sockets

 

Update for got to post one the connection for the wiring harness had oxidation just cleaned it and worked fine.