Altenator wiring issue?

J

JamesT23

New Member

Sep 24, 2024

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Indiana

Sep 24, 2024

#1

• Sep 24, 2024

• #1

Hey guys bought a 2010 mustang gt with a check charging light on. Been trying to diagnose for weeks now with no luck. Altenator and battery both test good on bench test. I’m thinking it’s a wiring problem. To start my main concern is the wires coming from altenator plug. Can anyone verify if these colors are correct and what they go to.
will also attach picture of weird bare wire that I don’t know if it’s normal. Thanks so much in advance

 

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89ripper

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Jun 3, 2002

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Rockford, Illinois

Sep 25, 2024

#2

• Sep 25, 2024

• #2

None of that looks normal it looks like someone hacked into a harness....is this car completely stock or have an aftermarket alarm or anything?

 

Bullitt347

I have been doing it wrong this whole time

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Mar 23, 2007

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Sep 25, 2024

#3

• Sep 25, 2024

• #3

The "bare" wire is part of a shielded cable that is supposed to help prevent EM emissions from corrupting the circuit.
It is normal to see when you strip apart the harness. Not used everywhere, but they are used.

 

Reactions: 89ripper

89ripper

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Jun 3, 2002

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Rockford, Illinois

Sep 25, 2024

#4

• Sep 25, 2024

• #4

Bullitt347 said:

The "bare" wire is part of a shielded cable that is supposed to help prevent EM emissions from corrupting the circuit.
It is normal to see when you strip apart the harness. Not used everywhere, but they are used.

Click to expand...

What do you make of that 2nd pic...when i zoom in looks like someone tied together wires

 

Bullitt347

I have been doing it wrong this whole time

15 Year Member

Mar 23, 2007

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Sep 25, 2024

#5

• Sep 25, 2024

• #5

89ripper said:

What do you make of that 2nd pic...when i zoom in looks like someone tied together wires

Click to expand...

Looks to be a factory splice.

 

89ripper

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Jun 3, 2002

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Sep 25, 2024

#6

• Sep 25, 2024

• #6

Bullitt347 said:

Looks to be a factory splice.

Click to expand...

Alright fair enough it didnt look like anything ive seen from a factory but i will admit i havent seen it all

 

J

JamesT23

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Sep 24, 2024

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Sep 25, 2024

#7

• Sep 25, 2024

• #7

89ripper said:

Alright fair enough it didnt look like anything ive seen from a factory but i will admit i havent seen it all

Click to expand...

Car seems to be stock. The plug pictures is the altenator plug and it plugs into 3 wires (orange/blue, purple, and red) along the fuel rail. The new alternator is a 160 output so more amps than stock. There is a red wire on the male end of the altenator pig tail like it has been put out of service. Should also mention that the diode fuse has no continuity and the charging system light seems to come on when car idle goes down after start up. Hopefully this helps

 

89ripper

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Jun 3, 2002

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Rockford, Illinois

Sep 25, 2024

#8

• Sep 25, 2024

• #8

I tried a search and couldnt find anything online...might try looking for one of these

2010 Ford Mustang Wiring Diagrams Schematics Drawings Color Codes Factory OEM | eBay

Find many great new & used options and get the best deals for 2010 Ford Mustang Wiring Diagrams Schematics Drawings Color Codes Factory OEM at the best online prices at eBay! Free shipping for many products!

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Im thinking that wiring is messed up or you have a voltage regulator problem...