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Thread: headlights dimming
08-27-2009, 10:40 PM #11
2tone is right the HD alternators do have more amperage so that wouold be good too!
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08-27-2009, 10:49 PM #12
Had same type issues when I built my car audio system.
Installed an Optima Yellowtop batt, 140amp Alt, and two 2-Farad Caps.
Also ran two seperate 2awg B+ wires from the Bat to the Caps, which fed the Amps.
This allows me to run my system with out frying the lights.
But I am only running two 1800watt Amps, Four 12" Subs, and Six 6x9 Tri-Ax speakers.
My 76 Impala is a big car, so it needed some big sound.
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08-28-2009, 01:59 AM #13
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01-19-2011, 09:53 PM #14
Ok so, I know I'm reviving a dead thread here, but I didn't want to start a new thread. Especially when I am the one who started this one in the first place.
Now, I've taken all of your suggestions and the only thing I haven't tried is getting the alternator rewound. I still haven't found a shop around my house willing to do that for some reason. Maybe I'm not asking correctly, I don't know. I also haven't replaced the alternator with a HD one, I'm really not that mechanically inclined, although I would love to be. I've replaced the wires with 4 and even tried 0 gauge wire at one point, still dimming. I was considering getting another battery for just my sound system, but I don't really have anywhere to put an extra battery, other than the bed, and I don't really want to mount a battery in my bed.
I have a family owned shop where I could go. It's where my dad takes his car to get it worked on and he always has. I was considering taking my alternator up there and asking if he could rewind it for me, but he has always been kind of a dick to me for whatever reason.
Any other suggestions would be much appreciated. I don't know what is going on, maybe I'm just really lucky.
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01-19-2011, 11:18 PM #15
01-20-2011, 02:30 PM #16
Look in your engine compartment I know on the GMT 900 platform (Silverados at least) have quite a bit of room, and almost a perfect place for another battery (possibly for diesels with two batteries??) I would try buying a aftermarket alternator with higher amp output and then if that doesn't fix it run a dual battery setup. Replacing an alternator is quite easy, though a shop should do it for a nominal cost.
If you dont have adequate room, looks at getting an Optima or a gel type of battery that allows you to mount the battery on it's side etc.
01-25-2011, 02:06 AM #17
01-25-2011, 02:29 PM #18
Have you had the system checked for a draw anywhere. There is no reason for your headlights to dim on such a low amp running your subs. The factory system should not be having any problem with it. My factory electrical can run, my 2 KC Daylighters and the 3 amps in the truck without the headlights or KCs dimming at idle.99 K1500 Suburban LT "THE BEAST"
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01-25-2011, 02:42 PM #19
I have similar set up to yours 2 JL 12w3v2 and a Jl 1000/1 watt amp also have a JL 300v3 4 channel running the components and no dimming at all I do have a red top and HD alternator. I would look into the alternator not hard to replace at all takes about 15mins.
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01-25-2011, 04:01 PM #20
My headlights dim on occasion .. depending on how loud it is. If I use my power windows then they do dim while using those. Upgrading an alternator is simply unbolting and bolting it back in. Should be quite easy especially on trucks ... for a cheaper route look for a wrecked HD truck at a salvage yard and use that one.. or buy a high performance either or should work.
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