Q: Seems to be a problem with electrical.

asked by on

Ok so, I start my truck up and it runs idles and drives fine, but it seems to be when I turn the headlights on it will start to bog out and lose power as you try to accelerate. Doesn't do it everytime. I've traced all the wires I could and can't find any bad grounds or corroded ones. So I'm starting to think the alternator is screwing up some how, but it keeps the battery charged. So from there I'm lost idk what could be messing with it bad enough to run fine with everything on but the headlights, but as soon as there on its starts running rough.

My car has 180000 miles.
My car has an automatic transmission.

The battery should be load tested and the output of the charging system should be measured. If the battery passes a load test be sure it is not a marginal pass in which case you should definitely install a new battery to reduce diagnostic headaches. Batteries are a very important component in a car’s electrical system. If this symptom you are having with the poor acceleration is truly tied to operation of the headlight circuit, the current draw of that circuit, as well as the ignition circuit, should be measured with an ammeter to determine if there is some sort of electrical problem. If it turns out that the battery is good, the charging system output is within Factory Service Manual specifications, there is no abnormal current draw on the headlight circuit (or voltage drop on the ignition circuit), your best option is to request a failure to accelerate diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. Seems to be a problem with electrical.

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: toyota carina 3 1996 diagonestic port

Thanks for writing in about your Toyota Carina. You should check in behind the left change drawer. You have to remove the drawer to see the connector. If the connector is not there, the next place to check would be...

Q: Car is starving for fuel at idle after warming up - 1991 Ford Mustang

Hi there. I usually start with the idle air valve in these cases, as it sounds like it might be sticking. Checking fuel supply - fuel pressure, filter, dirty injectors, as you have noted - is a good idea. You...

Q: Alternator belt came off of a 2006 Ford Taurus

Well, sounds like you might have a pulley that is locked up. Pulleys lock up because of bad bearings. When this happens the belt can start smoking as it is forced over the pulley and eventually break or get knocked...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.