its brand new.... only works one way... red to batt yellow to switched power..  other way nothing happens unless there are other wires i have to connect.. ground is good...

i even checked power right to wire harness of radio... power goes to batt on yellow of harness and switched goes to red of harness... and radio will not come on

when i switch them it works....  go figure... this is the second brand new radio that would not power up.....hmm... maybe not 12volts to radio??? why would it not be 12v?

Check your voltages and let us know. Especially if this is the second radio. The one variable is the red wire. Meter will tell you everything. Test light won’t get you the info you need.

ok...  will do.. good idea

Both wires are 11.88v

This way when it comes on it’s on a random station abs I have to tune it.  But it does store stations in presets but it won’t come back on to the preset I turned off to

Hooked the yellow up to a new constant battery wire I found and now it works like it should. Case solved.  First one was 12v but dim on test light.