If you are asking this because your lights are dimming, then yes a capacitor can help your problem, you will still have some dimming, but not as bad. The downside to this is that you can burn-up your altenator quicker. If you go out and get a bigger altenator then it will fix your problem. My advice would be, get a capacitor, if your altenator goes, then get a bigger one, but it's hard to tell how long it will last. So depending on how bad your problem is, you could probably save the extra money and just get a capacitor and play the wait-n-see game. Later