88 Bronco stereo wiring question

[timstumbo]

I recently bought a bronco that had the radio stolen out of it so the factory radio harness was cut off the wires. No biggie, I found a wiring diagram for my bronco online and I figured I would just hard wire the new stereo in. I have identified almost all the wires, but I had one question. The Left Rear Speaker Negative Wire and the Right Rear Speaker Positive Wire are both Pink/Blue. Problem is, I only see one of these wires. Does anyone have a explanation for this? Thanks for the help!

1988 Ford Bronco Car Audio Wiring Guide

Car Radio Battery Constant 12v+ Wire: Green/Yellow

Car Radio Accessory Switched 12v+ Wire: Yellow/Black

Car Radio Ground Wire: Red or Black

Car Radio Illumination Wire: Blue/Red

Car Stereo Dimmer Wire: N/A

Car Stereo Antenna Trigger Wire: N/A

Car Stereo Amp Trigger Wire: N/A

Car Stereo Amplifier Location: N/A

Car Audio Front Speakers Size: 5″ x 7″ Speakers

Car Audio Front Speakers Location: Doors

Left Front Speaker Positive Wire (+): Orange/Green

Left Front Speaker Negative Wire (-): Black/White

Right Front Speaker Positive Wire (+): White/Green

Right Front Speaker Negative Wire (-): Black/White

Car Audio Rear Speakers Size: 6″ x 9″ Speakers

Car Audio Rear Speakers Location: Side Panels

Left Rear Speaker Positive Wire (+): Pink/Green

Left Rear Speaker Negative Wire (-): Pink/Blue

Right Rear Speaker Positive Wire (+): Pink/Blue

Right Rear Speaker Negative Wire (-): Green/Orange

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[husker77 10+ year member]

I have had a few fords and iirc they share a ground. I am not positive because it has been a while since I did anything with them. Should be easy enough to check.

 

[TheUnderFighter 10+ year member]

Pics of Bronco or gtfo.

 

[keep_hope_alive Premium Member]

pull the rear speakers and visually verify. use a DMM to trace them or measure resistance.

if they are sharing a ground, then the pink/blue is positive and green/orange is the shared ground. but a modern head unit cannot share a ground since each wire is hot.

i would just re-wire the speakers. it's not that much work.

 

[timstumbo]

That's what I was thinking about them sharing a ground but in the diagram it's showing that wire for a positive and negative hookup. Sorry I'm new at his!

 

[TheUnderFighter 10+ year member]

pics of the bronco!

 

[timstumbo]

I figured it out. I pulled the rear speakers as suggested and was able to identify he correct wires. Should have done that before. FYI though, that wiring diagram was incorrect!

 

[brown7348 10+ year member]

This is scary, my first truck was an 89 bronco green with tan top, the first thing i did installing my first system was cut the little wiring blocks off thinking that the cd player directly wired to them, boy was i wrong i had to use snow caps and tape each one back once i figured out it came with a wiring harness.. this is wierd