Q: Battery, alternator, fuses, cpu....

asked by on August 29, 2016

Cars electronics effect other electronic ops. Exp. Lights will dim while windows roll up down. If the airs running the idle rises, car will run sluggish. I thought a larger battery might b needed, but that's just ccamps. My alternator works great, over its rating ( or however that works, tested very well ) I can't think of why these things happen or how to push more electricity to the car. One of the things that this effects seems to be the braking and power steering. This worries me. As before it's mainly the air that drains the avl power. While on I can feel a difference in the steering, tho very slight, brake and the idle raises car under performs. Takes longer for gears to shift maybe... I can turn the air off and it all goes back to working perfect. How can I provide more power so I can run multiple functions at once? Thanks, J

My car has 35500 miles.
My car has an automatic transmission.

Electric Problems Inspection $94.99 - $114.99 Get a Quote

Hi there, thanks for writing in about your 2013 Honda Accord. The conditions may be normal if you run too many accessories when at idle. First, have the alternator tested to see if it can put out the maximum amperage at the test RPM’s of 1500 or above. An alternator cannot put out its maximum amperage at idle up to about 1500 RPMs. If you are running the lights, A/C, and blower on higher speeds, and then the engine coolant fan comes on, this would exceed the alternator amperage and you would see some dimming effects at idle. Unless the alternator does not put out as specified, then there is no repair needed. If the problem worsens or becomes too bothersome, enlist the help of a trained professional to diagnose the electrical system in order to have this corrected.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I manually adjust the anti-glare rear view mirror?
The rear view mirror is an important safety feature that allows you to see what is happening behind your vehicle. At night, however, the glare from the headlights of vehicles behind you can diminish your visibility and your safety. To...
Noise coming from the front suspension
Hello. This is a condition you should get inspected and repaired sooner than later since it affects the drivability of the vehicle. The symptoms you're describing could be warped rotors, a bad wheel bearing, a bad tire, or worn suspension...
Can't remove third brake light
Hello, it's not uncommon for the heat generated from the third stop lamp bulb to warp and distort the plastic. This would lead to a bulb that can not be removed. If you do get the bulb removed, there is...
While driving at night, headlights occasionally turn off, so using high beams which do work
It sounds like there is a problem with the headlamp circuit. At first, I was going to say that the headlights have a poor ground connection, but then, looking at the wiring diagram for your vehicle, I noticed the high...
weird engine noise
Hello. Though this can be caused by a transmission failure, most of the time it is either caused by a cracked flywheel or a failing timing chain (https://www.yourmechanic.com/services/timing-chain-replacement). I usually try to narrow down the location of the noise as...
The steering wheel is shaking when driving at slow speeds
Steering wheel shaking could be caused by a couple of things. Check the condition of the front tires for uneven tread wear and how much tread is left. Having the tires balanced and aligned may resolve the issue. If not,...
the back passenger floor gets wet nothing else, what is the cause and what to fix?
Hello. Thank you for writing in. The windows have drain tubes and holes that take trapped water from the windows and doors and channels it where it can drain. These drains can become clogged over time with dirt and debris....
I bought an 2004 Audi A6 Quattro Sedan mode l3.0 v6 4 door for $1,000. The owner said he think it's the transmission and battery.
If gasoline was left in the fuel tank for more than 3-6 months, the tank would have to be thoroughly drained. Old gas will NOT start an engine. The fuel filter should be replaced as well. If the car has...
Location of thermostat.
Hello, thank you for writing in. While it is strange to think the thermostat (https://www.yourmechanic.com/services/thermostat-replacement) can be located on the lower radiator hose, this is common practice for some manufactures. The concept works exactly the same. The coolant entering the...

Related articles

How Does a Mechanic Check a Car Alternator's Volt Output?
Have Have you ever wondered how a mechanic checks your alternator? It’s not something that has to be done all that often, because usually alternators are maintenance-free, and they can last for up to 12 years without needing repairs. When...
A Buyer’s Guide to the 2013 Scion FR-S
This This sporty little twin of the Subaru BRZ offers the same light, fun to drive platform but in a bit more spartan, budget-minded form. The marriage of affordability and sports car-like driving is a successful one in the 2013...
Understanding the Honda Maintenance Minder System and Lights
Car symbols, or dashboard lights, are a car service reminder. The Honda Maintenance Minder codes indicate when and what service your car needs.