Electrical 3rd Brake Light/license Plate Lights


New Member
Dec 19, 2013
I have a 1989 Mustang GT and I am having issues getting my 3rd brake light and license plate lights to work. I found out why they don't work. The wires are cut just inside the roof panel. I just purchased a wiring harness off of eBay for the hatch but I don't know how to hook it up. There are three clips and a ground wire on the harness. Where does it connect inside the car to the power source? Does it run all the way to the fuse box or does it connect somewhere else? Any help would be greatly appreciated.
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PM me your email address and I will send you a complete Ford Factory 89 Mustang electrical diagram set. The zip file is 2.5 MB and is too big to fit through Stangnet's email gateway.

89 Mustang wiring diagrams zip package–

They are in a zip file format to reduce the size of the package. If you don't have Windows 7 or Windows 8, you’ll need WinZip or other Windows archive tool to extract them from the zip file.. See www.majorgeeks.com - Download Freeware and Shareware Computer Utilities for a free download.
The diagrams show the location area and the connectors are drawn to the same shape as those in the car.
You will need the Adobe Acrobat viewer which is also a free download – www.adobe.com/products/acrobat/readstep2.html - Adobe Reader download - All versions