Skip the auto shop - Our mechanics make house calls

Q: Dead Battery again

asked by on

My truck was running great but one day it would not turn over. Just 12 hrs after I last drove it, it wouldn't start. 'Your Mechanic' came out found the fuel pump was no good. 'Your Mechanic' replaced the fuel pump. The next day. The battery was dead. 'Your Mechanic came back out and checked the wiring and the alternator and belts, charged the truck, re-ran a new main wire(?). We let the truck run for about 30 min. Truck was dead again after 1 hr. Charged it, took to AutoZone (where I bought the battery less than a year ago) and they said it's not charging and it could be the alternator. 'Your Mechanic' came again and replaced the alternator which also was less than a year old. "Belt are less than a year old. "So must be your battery" Battery was replaced and now again a dead truck. 3 times out, 3 x $70 fee, new fuel pump, new alternator and new battery still same dead truck?

My car has 10700 miles.
My car has an automatic transmission.

You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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. Dead Battery again

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: My check engine light is on

Hi, thanks for writing in. If you have a check engine light on for a problem, then the computer may respond by increasing the cooling fan speeds if it see problems with the cooling system sensors. I suggest having the...

Q: Ignition problems

Hello. If you are losing battery power to particular circuits then most of the time this is caused by a bad ground connection, a failing battery cable, or it may be a bad transmission position sensor. It is common for...

Q: Transmission shifts only to first and second gear - 1994 Chevrolet C3500

It is possible you have a broken shift selector pin or shift fork (3rd/4thh gear). This needs a good look by a professional mechanic. A YourMechanic professional can help with this inability to shift issue.

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...