Battery good, alternator good, brand new alternator cable...

Q: Battery good, alternator good, brand new alternator cable, still not charging.

asked by on June 11, 2017

I need help finding out what could be wrong with my charging system. One day my 2003 Expedition didn't start, got a jump start and took it to auto zone to check. Battery voltage was too low to test, so I took battery out and left it out overnight, next morning picked it up, they said battery was good and held charge. Put battery back in and took it for testing, their test said the voltage regulator was bad, so bought a new alternator, installed it, same thing, not charging. Took old alternator back so they could run a bench test, old alternator came back good. So I just recently replaced the alternator cable thinking maybe it was the cable... nothing, still not getting a charge. My multimeter is only reading the current volts on the battery while engine is running, reading 12.4 volts and slowly draining. I can't think of anything else. As far as I know, I don't know of any fuses or relays assigned to the charging system. Please help. Thank you.

My car has 190000 miles.
My car has an automatic transmission.

Hi There, The first diagnosis of the bad voltage regulator is likely the cause of your charging system not properly charging the battery. 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. 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. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

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

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

What is the towing limit?

Your SUV can be equipped to tow at least a modest payload. However, it cannot tow the same amount as a pickup truck. Knowing the load limits is essential. You’ll find detailed information about towing and cargo limits on the...

How much it cost to replace passenger and rear door for volvo 2003 s80?

Billing question sent to CS for the cost to replace the passenger and rear doors to a 2003 Volvo S80.

I accidently over filled my oil 1qt will I be alright

If you overfilled the oil the crankshaft could contact the oil in the pan and cause the oil to foam up and cause engine to suck in the aerated oil into the oil pump and this could cause bearings to...

Related articles

A Buyer’s Guide to the 2011 Ford Ranger
The The 2011 Ford Ranger offers affordable pricing with excellent styling. It is a compact pickup that is both inexpensive to operate and own. The vehicle is capable of going off-road while still being able to tow 1,600 to 3,100...
How to Use the Ford Active Park Assist Feature
There There are few driving maneuvers as universally disliked as the parallel park. Most people still remember that terrifying sequence of movements in their driving test. Even people who live in metropolitan areas, people who must regularly parallel park, usually...
The Top 5 Selling Cars in Arkansas in 2012
Arkansas, Arkansas, like many other states, has to deal with a wide range of weather, from the stifling to the icy. This means drivers need vehicles that can handle the heat while also helping them get through slippery conditions. In...