If I am remembering correctly the factory alternator is 90 amps. It takes some horsepower to run a larger capacity alternator. 90 amps seems like an alternator large enough for a Cadillac, but the Fortwo uses alot of electrical amps to run the automated operations of the car like clutch engagement and gear shifting. The factory alternator puts out a fairly high dose of amps even at idleHi guys ive veen putting some sudio into my smart car like a sub and a couplr conpsct monitors. But ive noticed that the power draw is too great and causes the monitors to shut down to in audible levels. Is there a high outpur smart car alternator i could put in to make sure theres enough power to go around?
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Possibly you could run an auxillary battery and run a battery isolator to charge both batteries. What kind of amperage draw is your audio amp pulling at a high volume? Monitors that are LED shouldn't be an excessive draw. Electronic computerized equipment and such as your monitors are really suseptable to "dirty" power. Output directly from the alternator is a little on the dirty side in that if you were to connect an oscilloscope to it you could verift this by looking at the wave onscreen.
For test purposes run the power wires from your monitors directly to the starting battery terminals where they will get close to 14 to 14.1 volts when the car is idling and the battery will pacify some of the voltage spikes, and your monitors should work okay. Your amp will be much more forgiving of voltage spikes but may have some hum or buzz from the alternator. Try this and see if it helps and let us know. DCO