AboutBrad Sears Expertise All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.
Experience Automotive tech instructor.
Syndicated auto columnist 1970's though the early 1990's.
Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's
TV Show "Last Chance Garage" 1980's PBS-TV syndicated.
Auto instructor for the following companies:
Fram
Autolyte
Holly
Carter
AMF
Ford Motor
University Of Conn
Blue Hills Technical School
Sugar River Technical Center
Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.
Publications Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.
Education/Credentials More than I care to remember.
Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.
Awards and Honors Moto Award winner. And much more.
Question Hi my blinker, brake lights, fuel gauge and speedometer are not working in 72 ford f100. we have replaced all of the fuses and are chasing down the wires, do you know how we could fix this?
Answer This sounds like a series of problems not just one effecting all of the items mentioned. The speedometer is a mechanical device that is driven by a cable from the transmission. It attaches to the back of the speedometer. To check it disconnect the cable, pull it down under the dash so that you can see it when driving. take the car out on the road and while moving watch the cable to see if the inner shaft turns. If it does not then there is a problem with the cable or in the transmission with the gears that drive the cable. The fuel gage is not connected to the blinkers or brake lights. If the temperature gage is functioning then you know that you are getting power to the gage circuit as they both feed off the ignition switch. Disconnect the fuel gage wire at he fuel tank and with a digital voltmeter, not a test light, measure the voltage from the wire. It should be between 5 and 12 volts with the key on. If it is then the problem is with the sender in the fuel tank, if it is not then the problem is in the wire going to the dash or the dash gage itself. Now a question about the blinker and brake lights. When you turn the directional in either direction do any of the lights on the truck light up? That includes the front lights. They may not blink but it would be helpful to answer your question if you answer mine. Let me know.
Brad
