need help with a pioneer cd player

i have a DEH-P960MP its getting power to  but it wont power on. so i tested the power and grownd and the the hu plug i used a test light to see if it getting power and the ligt is very low so i was thinking the resitor is shot any help will be appreciate it btw its going in a 95 gmc suberban

If you have one check with a DMM, I would try running a new ground and see if that helps, did you test the red and yellow power wires?

dim??  low??  bright??    these have no meaning.... grab a digital DMM and meter for an actual voltage value... do you have 12 volts?   4 volts?   1 volt?     i tend to suspect that the DIM circuit will have little or no voltage on it ( maybe some residual circuit voltage ).... which usually indicates a blown fuse somewhere......

take that old test light probe, throw it in the garbage and spend 10-20 bucks for a cheap digital DMM.......