1978 Firebird Wiring?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=30847
Printed Date: May 09, 2025 at 10:51 AM

Topic: 1978 Firebird Wiring?

Posted By: paintballman895
Subject: 1978 Firebird Wiring?
Date Posted: April 22, 2004 at 1:43 PM

I looked ealier through the wiring diagrams and could not find what i needed, and i have searched EXTENSIVELY for a stereo wiring diagram for my 1978 Pontiac Firebird. If anyone could help me i would appreciate it.

Replies:

Posted By: flynntech
Date Posted: April 22, 2004 at 2:02 PM

That's an easy car. besides.....firebird or not....how hard can it be?

ground the HU to the firewall or trans tunnel, you need 12v+ continuous (batt).......this can be run directly from the....BATTERY + terminal (fused of course)

12V+ ACC, steering column if it's not already where the radio is.

The antenna and speakers...that's not to hard to get to the bottom of.

most of the wires are probably there, check for power and anything w/o power is probably the speakers. If it's a common ground system, you may need to run new speaker wires.

all the time you spent looking for the wiring codes, you could have wired it up and had it working...

Posted By: Sweekster
Date Posted: April 22, 2004 at 2:31 PM

if you still want the wires colors and codes get a haynes tear down manual for the car. They usually are great about putting in the wiring schematic with accurate wire colors.

https://www.haynes.com/na101.html#anchor567451

But it's easier to take Flynntech's suggestion. You'll probably need to run new wires anyway.

-------------
Duane...

If you think you're confused, imagine how you feel. posted_image

Posted By: mycustoms1980
Date Posted: April 22, 2004 at 4:57 PM

Constant 12V+	Orange
Switched 12V+	Yellow
Ground	Black
Illumination	Gray
Dimmer	Brown
Antenna Trigger	Pink
Antenna	Windshield
Front Speakers	3 1/2" Dash
Left Front (+)	Tan
Left Front (-)	Gray
Right Front (+)	Light Green
Right Front (-)	Dark Green
Rear Speakers	6" x 9" Rear Deck
Left Rear (+)	Brown
Left Rear (-)	Yellow
Right Rear (+)	Dark Blue
Right Rear (-)	Light Blue

there it is bro all gm wireing is the same in that year because gm is a union car maker this is common with all gm cars it rarely changes i learned this from my exprience doing alarms

Posted By: mycustoms1980
Date Posted: April 22, 2004 at 4:59 PM

all u pros should no gm by heart...lol

Posted By: paintballman895
Date Posted: April 23, 2004 at 6:52 AM

mycustoms1980 thanks for the table for colors but its totally different than that...my firebird has a single speaker in the front, and my dad originally had to put the two in the back of it...so its kinda frigged up. im almost positive that i know the ground and ACC wires and kno what wires go to the speakers in the back so im pretty set, i just had to look at it harder and stuff. the only prob. im having is that the ACC is no powering up the stereo and i checked the fuses and the wire w/a multimeter and i think it was broke so it didnt show anything. eh w/e im working on it...thanks guys.