On Thu, 6 May 2021 07:50:42 -0600, rbowman wrote:

On 05/05/2021 11:57 PM, Tim+ wrote:
I thought it was to to with everything being CAN BUS now. Most of the
wires just carry signals, essential power is carried by fewer thicker
wires.

I'm guessing the tail light wires on the Toyota are 22 or 24 gauge. No
problem for the application but considerably smaller than on my old
('86) pickup.

I have no complaints with the car but it is not over-engineered as was
typical in Detroit's golden years.

Tail lights used to draw a couple of amps, requiring larger fuses,
hence thicker wire.

You'll find that modern trailer harness assemblies, with built-in
protection circuitry, sometimes have trouble with old incandescent
bulb turn-on surge current in older trailers.

New cars may also have other kinds of limiters (faster), besides
fuses.