John, I do believe that you have answered the question. It would appear that
the
wiring diagram that I have is not for the '70. I assumed that the extra fuse
was
just to split up the load. As it doesn't show on my diagram, I further assumed
that
it carried power. Being wired the way you describe it would act as a ground
loop
when the fuse opens and cause the rather odd results that I observed. Many
thanks!! This has bugged me for years.
Best regards,
Fred Schroeder
Denison, TX
'70 SRL311-13359
TDROC
Home page http://home.texoma.net/~sitsinwest/
Regular e-mail sitsinwest@texoma.net
John F Sandhoff wrote:
> First, note that 1970 is DIFFERENT than prior years! On 1970, there
> are TWO fuses, one for each bulb, and +12 is fed to the 'common' (what
> you'd expect to be ground) terminal. To activate the lights, the hi or
> lo contact is brought to ground. So if you're using different bulbs, be
> careful as some of the HO stuff has the 'common' terminal grounded
> as part of its construction.
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