Ford F-100 Ballast Resistor Replacement at your home or office.

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Ballast Resistor Replacement Service

How much does a Ballast Resistor Replacement cost?

On average, the cost for a Ford F-100 Ballast Resistor Replacement is $420 with $325 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
1975 Ford F-100V8-5.0LService typeBallast Resistor ReplacementEstimate$764.53Shop/Dealer Price$936.92 - $1431.57
1978 Ford F-100V8-5.0LService typeBallast Resistor ReplacementEstimate$744.53Shop/Dealer Price$916.93 - $1411.60
1973 Ford F-100V8-5.0LService typeBallast Resistor ReplacementEstimate$744.53Shop/Dealer Price$916.93 - $1411.60
1969 Ford F-100L6-4.9LService typeBallast Resistor ReplacementEstimate$744.53Shop/Dealer Price$916.91 - $1411.56
1966 Ford F-100L6-4.9LService typeBallast Resistor ReplacementEstimate$744.53Shop/Dealer Price$916.95 - $1411.63
1981 Ford F-100L6-4.9LService typeBallast Resistor ReplacementEstimate$744.53Shop/Dealer Price$916.93 - $1411.60
1979 Ford F-100L6-4.9LService typeBallast Resistor ReplacementEstimate$749.53Shop/Dealer Price$921.80 - $1416.36
1971 Ford F-100L6-4.9LService typeBallast Resistor ReplacementEstimate$749.53Shop/Dealer Price$922.17 - $1417.02
Show example Ford F-100 Ballast Resistor Replacement prices

What is the Ballast Resistor all about?

Modern ignition systems use electronic circuitry to control voltage during engine starting and operation, but it wasn’t always this way. Older vehicles with points and coils did not have the benefit of circuit boards and computers, so another way to control voltage was needed. The ballast resistor coil was the solution. Think of it as a giant fuse in a way, although it serves a much greater purpose.

The ballast resistor coil plays several roles in your engine and charging system. In terms of position, it’s located between the ignition switch and the positive battery cable. During engine operation, the ballast resistor is responsible for lowering voltage applied to the coil to ensure that it doesn’t overheat and burn out, or damage the battery. During cranking, the ballast resistor allows normal battery voltage into the coil to ensure a good, strong spark for starting the engine.

The ballast resistor is subjected to significant amounts of heat during operation (the resistor’s resistance level increases or decreases with the application of heat and voltage). Over time, it will eventually wear out and need to be replaced.

Keep in mind:

  • The ballast resistor is not inspected during normal maintenance.
  • The ballast resistor is subject to significant amounts of wear and tear.
  • Ballast resistors are not generally found on fuel-injected engines.

How it's done:

  • The Ballast Resistor is verified that it needs to be replaced. The battery and battery tray are removed.
  • The defective Ballast Resistor disconnected and removed.
  • The new Ballast Resistor is installed, secured, and connected.
  • The battery tray and battery are reinstalled. The Ballast Resistor is tested for operation.
  • The vehicle is tested to ensure proper operation of the Ballast Resistor and road tested to ensure fan operation.

Our recommendation:

Over time and through normal use, the ballast resistor is subject to a great deal of wear and tear, and heat. This can cause it to fail unexpectedly. When this happens, your vehicle will experience unwanted, and perhaps dangerous, operation. It may crank but then stop running immediately after. Have any starting problems immediately diagnosed by one of our expert mechanics.

What common symptoms indicate you may need to replace the Ballast Resistor?

  • Engine cranks, but dies immediately when the key is moved back to the run position from the start position

How important is this service?

Without a ballast resistor, your engine will not operate unless you jump the resistor, which is dangerous, as it will eventually burn out the points, and is not recommended. If your engine dies immediately after turning the key back to run from start, likely the ballast resistor needs to be replaced. If the engine runs with the key in the run position, you may have another issue. Have it properly diagnosed by one of our expert mechanics immediately.

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Excellent Rating

(39)

Rating Summary
33
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3
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33
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Jose

10 years of experience
58 reviews
Jose
10 years of experience
Ford F-100 V8-5.9L - Car is not starting - Clovis, California
Jose was on time, answered all my questions in a professional manner and left me with a lot of confidence in his abilities. I would recommend him highly and I would use his services again.

Joseph

33 years of experience
540 reviews
Joseph
33 years of experience
Ford F-100 V8-5.0L - Power steering fluid is leaking - Flower Mound, Texas
He's Awesome!

Brikk

18 years of experience
389 reviews
Brikk
18 years of experience
Ford F-100 V8-5.0L - Car is not starting - Charlotte, North Carolina
He was very knowledgeable and helpful!

Michael

22 years of experience
67 reviews
Michael
22 years of experience
Ford F-100 V8-5.0L - Car is not starting - Las Vegas, Nevada
Michael went above and beyond to get me in after an address change derailed our original appointment. He also braved the elements in the dark to get a proper diagnoses. I am very happy with his honest, friendly approach. I will request him whenever booking an appointment!

Excellent Rating

(39)

Rating Summary
33
0
3
0
3
33
0
3
0
3
Number of Ford F-100 services completed
429+
services done by our mechanics
TOTAL NUMBER OF EXPERT Ford MECHANICS
1700+
experts on our platform

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