Q: Charging 14 volts and drops to 11 volts then back and forth

asked by on

Ford 302 c.u. carbureted with a fairly new alternator and a blaster 2 coil. The car will start and is charging 14 volts then for no apparent reason will drop to 11 volts then back up to 14 volts. I thought it may be a faulty gauge but when I take it out at night when it drops down to 11 volts the lights begins to fade. Then when it goes back to 14 volts the lights go bright. I've checked the connections at the alternator and the coil. Any suggestions?

This is most likely caused by a poor connection to the voltage regulator or the alternator. Try to lightly wiggle the alternator wires all the way from the battery to the alternator and regulator connections to see if you can get the voltage to jump when a connection is moved. If none of this works then you may have a defective alternator with a loose solder joint inside it. If you need help with this, a technician from YourMechanic can come to your car’s location to pinpoint the voltage issue and let you know what repairs are appropriate.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Charging 14 volts and drops to 11 volts then back and forth

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When my alternator went out, could it have killed my battery?

Hello, thank you for writing in. The symptoms you are having are classic of a failing alternator. While the battery can be damaged and fail due to the vehicle relying solely on it for power while running, you will want...

Q: Battery light flashing, car cannot be started

Hello there. In most cases similar to this, the alternator and battery will fix the issues you have described. In more rare cases, there may be other things that cause the same symptoms. They are the battery cables, alternator fuse,...

Q: Car shutting off in the middle of driving

Hello. The first thing that I would suggest that you do is have an inspection of the electrical charging system completed. It is possible that the alternator is working intermittently. There are brushes inside of the alternator that conduct electricity....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...