FAQs » All FAQs

Choosing The Correct Wiring Solution For Your Project

“A problem well-stated is half solved.” Delco founder Charles Kettering was truly on to something with that one. Whether you’re dealing with an engine misfire or turn signals that won’t flash, automotive difficulties have a way of becoming easier to resolve once you’ve explored your option... [ read more ]

I have your Factory Fit engine harness wiring, how do I hook up the wires to my starter motor? I have three posts, two small posts and one large post on my starter solenoid…

Typically, GM vehicles prior to 1982 have starter solenoids with three posts: Post # 1: Battery – This is the large post on the solenoid which is usually found on the center top of the solenoid.  This is the post where the positive battery cable attaches along with any battery feed wires that ... [ read more ]

General Motors Fuel Gauge Troubleshooting

Fuel gauge troubleshooting begins with isolating the problem either to the gauge, sending unit, fuse or wiring. The most common gauge problems are either a bad ground at the tank, or a sender problem. As with any electrical troubleshooting, it is best to check the fuse and all wiring connections are... [ read more ]

When trying to start my car, the engine cranks, but will not always start. Occasionally, when the engine gets spinning fast enough and I release the key, the car will sometimes catch and start. The vehicle is original using stock harnesses. What could be my problem?

A: This problem is commonly found on GM vehicles with stock point type ignition system that use a resistor bypass circuit. The bypass circuit provides a full 12 volts to the coil when the vehicle is in the cranking position. There are typically two ways that this was achieved. The first, and most co... [ read more ]

General Motors temperature gauge troubleshooting

Temperature gauge troubleshooting begins with isolating the problem either to the gauge, sending unit, fuse or wiring. As with any electrical troubleshooting it is best to check all wiring connections are clean, tight and free of corrosion. The following process must be preformed with the ignitio... [ read more ]

I’m wiring my 1964-66 Mustang after-market replacement parking light assemblies and the wire color codes on the after-market parking light assemblies do not match the American Autowire 510125 (AAW) 1964-66 Mustang classic update kit wire colors. What color wire on the replacement parking assemblies goes to which color AAW wire?

If you have purchased (shown below) replacement parking light assemblies for your 1964-66 Mustang, the after-market wire colors are Black and Light Blue on the double female connector and a Brown or Tan on the single male connector. To connect the after-market parking assemblies wires to an American... [ read more ]

Guide to proper soldering of terminals

The secret of good soldering is to use the right amount of heat. Too little heat will result in a cold solder joint; too much heat can seriously damage a component. The key factors in quality soldering are time and temperature. Generally, rapid heating is desired. If heat is applied too long, the fl... [ read more ]

Electric fan connection using American Autowire’s fan relay kit

From our Tech Tips series of videos…in this installment, Michael Manning addresses the proper use of our Electric Fan Relay Kit. Click below to watch the video: Electric Fan Connection Using Fan Relay Kit... [ read more ]

Tips for installing the Ford ignition switch for Mustangs, Broncos and Trucks

From our Tech Tips series of videos…in this installment, Michael Manning provides installation tips for the ignition switch provided in our Classic Update kits for the 64-69 Mustang, 66-77 Bronco, and the 61-66 Ford Truck. Click below to watch the video: Ignition Switch: Mustang, Bronco, Truck... [ read more ]
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