I'm installing two gauges very shortly.

Where is the best place to tap in for the 12v ignition source?

 

I tapped off the rear defrost switch, I forget which wires though... Although, I think the switch was moved on your year. Mine is under the headlight ****.

 

or go out and get yourself a digy meter so that u can test for a switched 12v.(they come in very handy for many uses in the future)..or the pull your radio out...and tap in there.yellow wire with black stripe may be your easiest area

 

I already have a few multi-meters. I was trying to avoid splicing into a dozen or so wires.

I will tap into the wire behind the radio. Thanks

Do you know which wire leading to the radio is for the dimming of the lights?

 

1999 Ford Mustang Stereo Information I had to pull out some books to refresh my memory.I stopped installing in 1998

Constant 12V+ Light/Yellow
Switched 12V+ Yellow/Black
Ground Black/Green
Illumination Light Blue/Red

 

Are those taps the same for a 03?

 

why dont you just tap into the fuse box?
they always leave open slots for extra stuff.
just a thought.

 

usually the wire for dimming of the lights is light blue with a red stripe, atleast on the older fords.

 

WHY HACK INTO SOMETHING THAT IS FUNCTIONING or OTHER SWITCHES ETC??? I have always wondered why people do this... i would suggest the cigarette lighter socket, or in my case i always tap stereo power that i ran to the back for my amps. I have even had a small fuse panel for different things i have working

 

Because those aren't ignition switched.