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# 4 Fuse keeps blowing on Old Body Style direct effect on torque converter
The number 4 fuse continues to blow. After researching, this is the common "Ford Brown Wire" issue. Inside the headlight switch is a connector block. The brown/white wire is notorious for shorting out. This in turn knocks out the marker lights, and tail lights. This was the case with 91 Ford F-150 and 97 F-250 Super Duty. Clip all the wires, I bought both new switch and wired plug, connected and all was good.
A third brake light on the back top of cab being burnt out can cause your transmission to shift out of overdrive. From 94 to 97 for some stupid reason, Ford decided to attach the brake lights to the transmission. When the 3rd brake light burns out or burns up the plug (normally this will be the problem) the computer gets a "open circuit signal" and send a signal to the computer to down shift. If you are driving up a hill, you transmission can shift into overdrive. When you start down the hill, your tranny will shift down out of overdrive into D3. Just the opposite of normal. I had this issue for 3 years with my truck. Replaced the 3 brake light plug and bulb and the tranny worked perfect.
It appears that if you have # 4 fuse issues. Change the switch, plug, and then check all your marker light and tail light "PLUGS". Make sure they are not shorted out and fused creating a dead ground that will continue to blow the #4 fuse. If I could have found a posting 3 years ago, I would have saved many headaches and about $2,000.00 in Ford shop rip-off. I truly hope this helps someone. If you have any questions feel free to contact me.