Dimming headlights

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17 October 2005 | 08:03 AM

S11EPS

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Joined: Oct 2004

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From: St.Neots, Cambridgeshire

Dimming headlights

Morning guys,

Having installed my new 10" JL sub this weekend (powered by an Alpine MRV 505 V12 amplifier), I drove round with the tunes cranked up only to notice that my headlights dim an alarming amount!

I have experienced this before, but on older cars and when sat at tickover with other electrical bits n bobs running - but this is happening to the scoob with no other load on the cars electrics and at 4000rpm+!!!

Slightly worried, as when i really turn it up I experience dimming interior lights etc. I realise this is the result of massive current draw, but what can I do to stop it? Will fitting a capacitor to the amplifier powering the sub cure this, or do I have to look at more drastic options?

Edit to say, car is a 2004 (54 plate) WRX, UK car, if that makes any difference.

Last edited by S11EPS; 17 October 2005 at 08:16 AM.

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18 October 2005 | 03:11 PM

scoobnoob05

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Joined: Feb 2005

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Quote:

Originally Posted by S11EPS

Morning guys,

Having installed my new 10" JL sub this weekend (powered by an Alpine MRV 505 V12 amplifier), I drove round with the tunes cranked up only to notice that my headlights dim an alarming amount!

Edit to say, car is a 2004 (54 plate) WRX, UK car, if that makes any difference.

hi mate
i had the same dimming on a standard 05wrx head unit!!!!

have you done "the big 3 Upgrade" ?

1. the battery negative to chassis cable
2. the alternator to battery positive cable
3. thechassis to engine cable

I added (extra) 4awg versions of the above to the standard wiring and have had not a hint of dimming (running sub amp and 4channel amp)

That would be a good place to start before adding a cap.

Hope that helps

J