Alternator Amperage?/Check My Math, stock alternator and battery

Hey gents, so I'm looking to pick up some KC Daylighters and I've decided its probably a good idea to start doing some math as to not overload my alternator/battery. Firstly, I haven't found a concrete answer to the total amperage output of the alternator in my 2007 base model V6 (no tow package). I've read its around 100a, but no confirmation. Further, anyone know how many amps i can expect the truck to draw at normal usage? in 4x4? Also, my total usage math is below; looks correct right? assuming my battery voltage stays between 13.7-14.1v?

Driving Lights: 110w=7.8-8.1a
Fog Lights: 110w=7.8-8.1a
CB: 4w= .28-.3a
Stereo: 50w= 3.5-3.7a
Bed lights: 110w=7.8-8.1a
Daylighters: 520w= 36.8-37.9a

Total: 63.96-66.2a

Now its very, very unlikely that I'd use all of these at once, but id rather see what my max output is and see if i'll be under that. Thanks for any help,
Nick

 

You are on the right track. But I assume you are doing the "amps = watts / volts" calculation?? With the volts = 14 roughly as an assumption? That's OK for the light bulbs, although if you notice, your headlights vary in brightness as you change the voltage (IE engine off vs engine on) so you can't quite assume 100w period. No idea what that 100w light might have been tested at, voltage-wise, but it will almost certainly be closer to 12.4-12.6 volts than 14+, which means you will probably be safer if you just divide wattage by 12.0.

For audio, it is different. For a 50 watt output, assuming 100 watts burned won't be far off. There is no 100% efficient amp on the planet. That's why they produce a lot of heat and have all those heat sinks on the output power transistors...

You CAN find a good DC ammeter. Crank your truck FIRST, then disconnect one battery post and connect that ammeter between the post and the cable. Now you can discover exactly what the current draw is with the truck running and the alternator helping out...

 

Thank you for the response, anyone else wanting to chime in please do...still curious about this. Though I may be biting the financial bullet and going with LEDs and just not have to worry about it.