been thinking about buying a new alternator. my stock alternator is 130 amps. i have found 150-250 amps. i run a galaxy 66v ts mod-v and a sweet 16. i have an extra battery with a 2f cap. right now my volts are 14.3 with nothing on and the volts drop to 13.2 when i key up and start moding. how big of one should i step up to thanks for your time and help
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new power
- Thread starter rockenranger
- Start date
That voltage drop is normal. It's the difference between the voltage of the alternator with no 'load' on it and when under a 'load'. Increasing the 'size' of the alternator can make that no-load/load voltage difference smaller, but it's still going to be there. It isn't a 'fault' to start with, but if you want to place blame for that 'fault' put it on the voltage regulator, not the alternator. That 13 (+/-) volts is the 'operating' voltage of the whole system.
- 'Doc
- 'Doc
You are going to need 50 amps just for the truck so a 250 amp alternator should cover it. The 2 farad cap is worthless for a CB amp but it does have a neat voltmeter built into it.
I ran at one time in my mobile a 2x8 a 300 amp alt and 6 battery's which was overkill for the setup for it worked out nicely. I would atleast add one extra battery and a 300amp alt that way you've got some cushion and a little room for upgrades