So 5 amps each for the bulbs For a total draw of 10 amps on just the headlights alone. So with a typical 25 amp generator, leaves 15 amps for ignition, turn signal, tail and brake lights, relays, horn, dash lights, fuel gauge, heater/defroster, radio/stereo, cigar lighter, interior lights, license light, idiot lights, clock and losses through the switches and wires. Worse I guess if you are adding basic stuff like tach, additional guages, other small accessories, you can see how it all adds up and might exceed the 15amps left after the halogens are added.
There is no doubt that the electrical usage adds up.
You might even strain your 37 amp alternator.
The question I asked was regarding a 100 am alternator: asking what other devices might exceed the 37 amp alternator you now have.
