> > To start let me say that my truck was long since modified by the time I
>got
>> it. Now in trying to re-wire the beast I am coming to some rather
>important
>> decisions. For instance, on the old system there was no dipper switch for
>> high and low beams. There was a military rotator switch to control how
>many
>> lights were on (breakfast, wing, front aux., etc.), and a three position
>> toggle to control high beams. The first position was off so only low
>beams
>> were lit. The second position lit the inner high beams, and the third lit
>> the outer. Any of you that know the typical scenario will recognize that
>> this leaves ALL the filaments burning, high and low on all four
>headlights!
>> That's a huge draw on the electrical system. My electrically non-inclined
>> brain can't see a way to reproduce a dipper style switch using relays and
>> standard toggles. Is it possible? Though I like the immense light the
>old
>> system threw out, my delco couldn't keep up. Even now with a high output
>> unit I don't want a constant heavy load like that being imposed. Any help
>> in general with the wiring would be appreciated. Currently the wiring
>> diagram is being 'muddled' together.
>
>The trick is to use the automotive relay to its fullest extent. The relay
>has two output pins. One is Normally Closed (NC) the other is Normally Open
>(NO). You run the headlight low off the NC side, hitting the foot switch
>switches the relay, the NC becomes dud and the NO power up you high beams.
>Simple, easy. Of course you need another relay upstream of this contraption
>to shut power off to the low beam (and consequently disable the high beam as
>well).
Not all relays have both outputs. They're easy enough to buy new,
but if you're like me, and don't buy these things, they're a bit
harder to come by. What you can do with a pair of normal NO output
relays up to a normal dip switch. The dip switch has one input and
two outputs. The input is obvious, connect one output to a relay to
control the low beams, the other to a relay for high beams. Size
appropriately if you're going to control all four bulbs from one
switch.
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