You can acheive the same results as a power cap by upgrading the 3 earth points in the set up.
Mr Bump said:
Have you upgraded the big three? The alt to battery/battery to earth/engine to chassis cables?
A bigger battery could be an option. The biggest that would fit in the standard position.
A cap is useless.
Bigger battery, second battery, bigger alternator. They are the real options.
That is taken from a post on Talk Audio (
Thread Here)
There are hundreds of threads on all ICE websites talking about how caps are a waste of money, and that it's always better to upgrade the battery, bigger alternator, and the 3 earth points as above. All a cap does it act like a fancy little battery, which "looks good". Most of the time, they don't cure the symptoms of dimming lights etc, as the rest of the system can't cope.
If it was my choice, I'd go for a second battery, and split charge it, and upgrade the 3 earth points. Failing that, bet a bigger alternator, like one of a big diesel engine.