5k/100 euro lights into 5kcstq/200

[Wallace White]

Ti Kan wrote:
> 
> What would be more telling is to measure the voltage across the connections
> on the H4 bulb pins, and compare that to what you get between the
> alternator output and the alternator body.  This will includes any voltage
> drop in the ground side as well as those on the positive side.  A relay
> harness is going to be a nice improvement, no doubt.

Right you are, so here are the full numbers:

GND    - intake manifold ground point
0.23 V - ground (brown) to H4 bulb
11.3 V - low-beam (yellow) to H4 bulb
12.6 V - jump start post

So 1.5 V of lost potential, indeed a considerable amount. Maybe a tiny
bit more if measured from the alternator. But this was true with my DOT
lights too.

Regarding the wiring of the bulbs: the lights came with sockets wired in
factory colors, so I've assumed they're correct. Looking from the back
of the socket:

                 LOW
                  -
        GND    |     |   HIGH
              
I believe that's right, because on "low" the filament with the
sheet-metal reflector is the only one that's on (so that light goes up
out of the bulb when installed). On high it swaps to the other filament.

And now on to the lazy turn signals: with the marker light in (and wired
for marker flash), the ground rises to 0.10V when the turn signal is on.
If I disconnect the marker light, the turn signal ground is 0.01V and
the turn signals function normally... 

- Wallace
  '87 5kcstq 176k