View Single Post
Old 06-18-2008, 11:41 PM   #83 (permalink)
Xringer
Old Retired R&D Dude
 
Join Date: May 2008
Location: Woburn Mass USA
Posts: 702

Little Red - '12 Toyota Prius c 2 Two
90 day: 57.82 mpg (US)

"Whitey" Bulger - '14 Toyota RAV4 LE
Thanks: 10
Thanked 18 Times in 17 Posts
Using diodes to drop voltage is smart, since there is hardly any power loss to heat.

Using a "smaller fuse" won't work, since a fuse is a safety device, not a voltage dropper. The fuse element melts in half to protect from over-current. That causes an open circuit. Lights out..

A long thin "feed wire" would work. If it were long and thin enough to drop 3.5 volts,
the remainder of the voltage would be applied to the headlamps.

BUT, the wire would get warm. 3.5V x ~10 Amps =35 watts of heat. Wasted heat.

~10A is assuming 2 lamps at 5A each. 13V x 5=65W lamp..
I have no idea what wattage headlamps are used these days..
__________________
Cheers,
Rich

Current ride: 2014 RAV4 LE AWD (24 MPG)

Wife's Pizza Transporter
  Reply With Quote