I appreciate you answering the question.Well since you are going against the grain, Pretty much anything. You just want low resistance. At least 16v rated and preferably 20v. I whatever size you want. Though seriously odds are the dimming is related to the slight voltage sag the regulator can't catch. Most likely not fixable by a cap.
I would seriously take a short piece of power/ground wire and just reground battery to car. Add the wire to the existing and just make sure the connection point is clean and bare metal. You might be surprised at the outcome. plus it is an easy test.
Hmmm.....I have this friend I don't like and.......SO, WHAT IS A CAPACITOR GOOD FOR?
6. A neat thing to tell your friend, "..Hey man, lick the top of this..
Please do not try # 6. New hairstyles are always refreshing, but if you are wearing railroad tracks across your teeth, you might have one big filling after it痴 over.
I've got 2 Brax IPC Caps which feed my Brax amps which have special circuitry for cap input with separate power supply exclusively for the caps. Music has very fast attack and sound very very accurate but no harshness.If I was to use a Cap, the only ones that would go in my car would be either BRAX or HELIX.
If it's too expensive, well too bad... You asked for opinions, here's mine