jdmek9

I've had my car (98 Civic Hb) for almost 2 1/2 years and I've noticed that in the past year or so, everytime I drive my car (usually at night) my lights start to flicker. At first it didn't bother me but then it became a huge annoyance. I start my trip with the lights just fine and after a couple miles, they start dimming and then getting brighter after a few seconds... It happens everytime I drive at night. I'm not sure if it happens during the day because I can't see the lights but most likely it does. I do have an after-market head unit, a 200 watt amp and a 12 inch subwoofer but remember it only started doing this in the past year and I've had the system in since I bought the car.

I thought it was my battery and to my surprise it still had a factory Honda battery in it, after like 8 or so years! I put a new battery in two weeks ago and the problem continues...

I only have one possible solution to this. My alternator, as far as im concerned it has never been changed, but I want to know if there could be another reason as to why this is happening before I buy a new alternator, any ideas or info. will help!

Thanks in advance

dieneverknowing

Do your lights actually flicker (like off and on) or just dim? And if it is just dimming, do you notice it happening when you shift?

If the light is actually cutting off and on then there's some connection issue (loose wire, corrosion, etc)

If the light is just dimming I'd take it somewhere where they can test your alternator, especially under full load. That way they can see if it's helping to supply enough juice when everything is going.

jdmek9

Yeah to clear it up, they don't flicker like completely off and then on again rather they dim really low and they brighten way up like a second or so later. As far as im concerned it happens the whole time, braking, shifting, accelerating, cruising, etc... in other words: always!

If it is the alternator, do they charge to have it checked out and does anyone know a rough estimate of a new alternator?, my dad and I can install it so thats no prob.

Thanks again

dieneverknowing

Do you ever notice if they dim or brighten when you hold a steady speed and rpm?

Most places will check your battery and alternator for free but you usually to take them out. Some places should be able to test your batter and alternator while in the car, but they might not do it for free. Best bet is to call around and see what can be done.

As far as pricing goes, it depends whether you get new or re manufactured. I'd say expect to start around $150 and up

mason rocket

it is possible that its connected to the stereo system. does it happen with the radio off?

remy

if u can change an alternator im pretty sure you got to be able how to check if it is bad!!

all you have to do is check the voltage on the battery while the car is on!!

places like autozone and the like will check it for free!

jdmek9

Yeah alright sounds good, i'll just have to wait till the weekend cuz I live on campus and have to drive home or look around town here...

I know for a fact that it happens even when I have my stereo system off. I guess I've never paid attention to it while at a steady speed or rpm cuz I don't have a tach. but I don't think it does, the reason being is that when it does happen I usually slow down cuz I don't want my car to shut off while at a high speed.

mason rocket

Ok then . If you rev it and the lights get brighter and then dim down when it goes to idle i would lean towards the alt. if its totally random then hmm......

remy

yes that happens because the alternator is not able to keep the battery voltage at the normal level!!

a remanufactured alternator should solve the problem!!

Jafro

verb to tha remy.

I bet your car doesn't do it for a few minutes when you drive on a cold engine. Heat makes electronic parts less efficient. Everything that can wear out in an alternator makes heat when it dies.

The part that's going bad is the voltage regulator. It controls the amperage and voltage of your car sorta like a floodgate so that as you rev up you don't overload everything, and its job is to charge the battery. Amplifiers wreak havoc on voltage regulators because of the heavy draw of current when the bass hits. In older cars it was a separate part from the alternator (and under $10). Nowadays since it's integrated into it, you have to change a much more expensive part when they go bad.

In the words of a professional mechanic, "you're supposed to change the battery with the alternator 'cause they'll both last longer."