I am trying to hardwire my V1 radar detector into my 2006 RL. As several posts suggested, I got a mini add a fuse (specifically a Buss Fuses HHH accessory mini add a line) and crimped the wire to the V1 direct wire assembly. I attached the ground from the direct wire assembly with a screw and nut to the metal frame that holds the diagnostic plug. I removed the 7.5amp radio fuse and plugged the add a fuse in with the original fuse at the bottom and a 2 amp fuse for the top. I plugged the add a fuse in....no power to the radio (as it should be) but, the radar dectector had power (to be clear, this is with the ignition completely off). I flipped the add a fuse to see if that would make a difference and it still gave ignition off power to the V1. I tried the TPMS fuse too and get the same result (thinking the TPMS fuse had to be a switched one too).

I am stumped ! I would greatly appreciate any suggestion or even an explanation on how this is possible!!!

 

You chose a fuse that is always hot. The manual has a fuse map that will tell you which are which.

What fuse # did you use?

 

I used the radio fuse (#5). People in other threads have used it with success. Since the add a fuse is rated at 10 amps, I was looking for fuses 10 amps or under.

 

Post a link to the other threads... most radios are always powered for the memory and clock.

You need a test light to track down the right fuse.

 

Here is one...can't find the other I saw from a google search.

https://acurazine.com/forums/showthr...hardwire+radar

Someone else used the ACC fuse, so I guess I will try that next...

 

got it, yea its clearly the radio fuse... I still rely on my test light.

 

Use the ACC fuse.

 

Its been too cold to mess with, but I finally tried the ACC fuse. Works like a charm!