I'm not 100% sure you answered my questions.
I'm not looking at adding a second battery, I am simply looking to determine if a larger battery to replace the current AC Delco OEM battery would make sense.
How do I perform a load test to determine if the present alternator is adequate? Is this something that I can do or do I need to bring the truck to my mechanic? I am assuming that a 145 Amp alternator should be sufficient considering I only have a 1000 watt RMS car audio system? Or is this alternator matched only for the vehicles OEM electrical system?
I'm trying to figure out if the current 145 Amp alternator is up to the task. Voltage at the battery varies depending on the load, but it is typically around 14.5 to 15 volts. Charging does not appear to be an issue at present. However, I believe that a volatage measurement either at the battery or at the alternator isn't going to tell me the whole story. The only issue I notice is some dimming of the headlights when the audio is cranked up and big bass notes hit. Again, my subwoofer amp is 600w RMS X 1, so it's not huge.
Some have suggested a larger battery as the next step, while others suggest a high output alternator. I'm just trying to determine which next step may be the best choice.
Monday, June 8th, 2009 AT 7:04 AM