harness prob. pleeese help

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jamrok55

New Member

Apr 22, 2005

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Jan 22, 2009

#1

• Jan 22, 2009

• #1

i have a 90 4cyl im swapping to an 8.the harness coming out of the firewall by the brake booster has only 1 brown plug unlike the grey and black all the other years have.but i only see the brown plug on 91 stangs.im a little confused.what year engine harness do i need?from what i understand the 4 cyl is unmolested but people are saying 91 is the only year with the single brown plug please help...

 

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SFC_R0CK

Member

Oct 30, 2008

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Jan 22, 2009

#2

• Jan 22, 2009

• #2

According to stykthyn those are the ECU harnesses that match up with the same dash harness.

stykthyn said:

87-89 I know are the same
90 not sure
91 was a stand alone year they are not compatibl with anything else
92-3 are the same.

if you have a donor car from a different year you will need all the harnesses and the ECU from the donor for it to work.

Click to expand...

 

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cheese_05_70

New Member

Aug 29, 2005

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IL

Jan 24, 2009

#3

• Jan 24, 2009

• #3

I did the 4 cyl swap and i was always under the assumption that they changed it after 90. I have a 90 harness on mine the only problem i have is that my horn dont work.

 

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SFC_R0CK

Member

Oct 30, 2008

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Jan 24, 2009

#4

• Jan 24, 2009

• #4

Check your horn fuse and your horn relay, do you know if the horn worked before the swap?