9 replies to this topic

[df13]

Hey Guys got a 306 diesel battery and a 70amp alternator driving 2 12" subs and amp but my lights are stil dimming is there any way to prevent this? or make it any better?

David.

[pbrain]

let us know what amp & subs you got.

if it's minor dimming, sometimes a decent cap next to the amp will help.

for serious problems/dimming, including poor starting next day, then alternator upgrade is what i'd recommend.

[df13]

haha how did i know someone would pop up and say a cap imo there pointless but still, got 2 12" jl audio 300W subs and a jbl GTO 520 amp

[pbrain]

haha how did i know someone would pop up and say a cap imo there pointless but still, got 2 12" jl audio 300W subs and a jbl GTO 520 amp

They DO work if you're cabling is decent...up to a point. Some noobs will wire their systems with any old bits of wiring, i suggested a cap as a cheap first step (these can be had now for around £20 rather than investing in a relatively expensive, high power alternator).
Assuming you're not a noob, you'd have done the the main supply in minimum of 8 guage, checked all connections for <1 ohm resistance (closer to 0 as possible) or ask someone who knows about Installations (NOT a Halfords 'kid')

[clambert81]

a 70 amp alternator is as big as the standard ones go.

[df13]

yer i've got 4gauge wiring kit and it's all wired correctly and im thinking of getting a 90amp alternator but not sure on that atm... also guna upgrade my engine and battery earths to zero gauge wiring

[Brams96]

If you still have the space in the boot then fit a second battery with a split charge system so your main battery is used to start the car but when its running your running the car & sounds off two batteries. Or alternatively (if you can afford it) get a bigger single battery like the OPTIMA RED TOP with 800CCA @ 0 degrees you should have all the power you need.

Edited by Brams96, 27 November 2010 - 07:26 AM.

[Bungle]

is the engine running when this happens ?

[df13]

is the engine running when this happens ?

Yes the engine is running when this happens and i was tempted to cut and weld another battery box in and get another 306 battery and link it somehow

David.

[Brams96]

Check out some of the threads on here as other people have asked about how to do a split charging system before. 2nd Battery LINK & Dual Battery LINK
Here's one from ebay LINK