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89 Mustang w prem sound yellow power wire not constant

  • Thread starter Thread starter HemiRick
  • Start date Start date Mar 25, 2021

HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
723
272
73
Memphis TN
Mar 25, 2021
#1
  • Mar 25, 2021
  • #1
It should be according to the diagrams I've found....I cant find a wiring digram of where this power comes from....my yellow wire is not constant.
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
Admin Dude
Jan 4, 1985
43,142
21,317
234
Box behind Walmart
Mar 25, 2021
#2
  • Mar 25, 2021
  • #2
Yellow is generally [Ignition On] power.
 

HemiRick

I'd be looking at jacking under the house
Jun 28, 2020
723
272
73
Memphis TN
Mar 26, 2021
#3
  • Mar 26, 2021
  • #3
yellow is switched, light green is constant.....
 

General karthief

wonder how much it would cost to ship you a pair
20+ Year Stangneter
Aug 25, 2016
27,949
10,587
203
polk county florida
Mar 29, 2021
#4
  • Mar 29, 2021
  • #4
Yellow/ black stripe is switched power, hot in accessory and run. Comes from fuse box, 15 amp.
The only yellow wire (no stripe) is LH rear amp imput return. Is this the premium sound system?
 

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Apr 2, 2021
#5
  • Apr 2, 2021
  • #5
The wiring diagram is strange.

here’s the non-premium radio. Fuse 11 is hot at all times. I think this is an error as fuse 8 powers things that do get constant power.



Here’s the premium radio. Fuse 11 is switched. Fuse 8 is now hot all the time. I think this is right based on looking at the power distribution diagram. In tjing case, the light gray is your constant
 
Reactions: dan50

Mustang5L5

That is…until I whipped out my Bissell
Mod Dude
Feb 18, 2001
43,260
17,945
224
Massachusetts
Apr 2, 2021
#6
  • Apr 2, 2021
  • #6
Here’s the full 1989 premium wiring diagram

 
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