On Sun, 5 May 1996, John T. Blair wrote:
> Greg,
>
> You are absolutly correct on your planned wiring layout.
>
> You ask: "How do I set the headlamp relays "in parallel"?
> What do you mean?
I'm refering to the article on upgrading your lighting system in the SOL
tech section. it states :
"At the very least, you want a relay and fuse on the high beam circuit.
The best (and easiest!) way to
do this is to buy a fused Marchal 514 relay. They're bulletproof, and can
easily be spliced into the
high beam circuit. Find some source of unswitched 12V (brown wire, you
want a heavy one). Find
the blue/white wire leaving the dip switch (usually there's a connector
that connects the switch, the
lead out to the lamps, and the indicator - this is a good spot). Connect
the brown wire to the source
terminal on the relay. Connect the U/W wire coming from the switch to the
coil. Connect the U/W
wire going to the headlamps to the load. Make a good coil ground. Voila!
You now have brighter
high beams, even if you didn't change the lamps. (If you're particularly
anal, wire the new harness
with appropriate colors - I would use blue/slate for the lead that
splices from relay to the headlamp
wire). Use heavy wire for the load connections - 14 gauge.
...snip...
Now, if you're having fun, you can rig a *parallel* relay for the low
beams. If you're going to do this,
then consider not using two Marchal relays, but two unfused relays,
*sharing a single source*, which
you fuse. "
end quote.
Oh. I guess that doesn't really mean "parallel vs in series". How do I
share a single fusable source? I have 3 of these relays I'm going to use.
Is a 20 A fuse good enough?
My driving lamp switch has 2 wires , one goes to the light and one to
power. I take it the one going to power remains (I have it hooked to
ignition so they turn off automatically with the ignition;will they still
do this? or do I connect the #30 connection on the relay to the coil?) and
the other
goes to number 85 on the relay? I'm putting the relay as close to the
headlights as possible (where the U/W splits to the headlights for the
high beams for example).
> If you try to put the actuator side (the relays) in parallel or the
> output sides in parallel, you'll have a problem. Any time you turn
> on any one item, they all will be actuated.
So I should give be able to run all of the 30's to a single fuse and then
to the battery, and the 86's to a common ground?
>
> >Here is an ascii diagram of a BOSCH 12V 30 A relay that I plan to use to
> >relay my headlamps, one for wach of low beam, high beam, and driving
> >lamps.
> >
> > 85 87 87
> > o o----o
> > ___|__ \
> > | / |__ __\
> > | / | \
> > |_/____| o
> > | 30
> > o
> > 86
> >
> >This is the diagram on the side if it.
> >
> >I want to double check what connections would work.
> >
> >87's to right and left lights
> >30 fused to brown (battery)
> >86 ground
> >85 to switch.
> >
> >What am I missing? How do I set the headlamp relays "in parallel"?
> >Setup is for a 72 MGB. Wiring is 14 guage.
> >
Thanks John.
Greg
________ ___
/ ______/ | | Greg A.M.Johnson '72 & '66 MGB
/ \ ___ | | Biology Dept.
\ \_\ \ /\ __| | Dalhousie University
\______ / \________| Halifax, N.S., Canada
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