John,
Follow Jim's recommendation and check your grounds to make sure they're
clean and tight.
Now, as to the "S/Brake" business. I am a low-winshield
guy, and have never worked on a '70 model. But, I thought "S/Brake" stands
for "Service Brake", meaning the hydraulic brake system, and having the light
illuminate was a warning that the fluid level in the master cylinder is low.
If so, that type of light is usually illuminated when the ignition is first
turned on, so you know the bulb works. It should go out by itself after a
couple of seconds. I may be completely full of doo-doo on this one, but I
don't think you want to wire your alternator so that light goes out when the
alternator voltage reaches a predetermined point. Unless such a function was
performed by the stock alternator/regulator and was bypassed or rendered
inoperative when the GM alternator was installed. This should provoke some
comment from the List, hopefully someone who knows how that circuit is
supposed to work.
Gary
________________________________
From: John
Stromgren <lutepisk@gmail.com>
To: Roadster List
<datsun-roadsters@autox.team.net>
Sent: Sunday, August 10, 2014 3:57 PM
Subject: [Roadsters] Another electrical question
Hello, All!
Here's
another puzzle add to the recent electrical questions.
I had my 1970 2000
painted this (northern hemisphere) winter. I carefully
cleaned all the
connections as I put the lights back on - everything seemed
to be working well
- including the refurbished radio, that I had never
heard since buying the car
back in 1997.
Then I got caught in a downpour at the end of a workday. The
new
windshield was not sealed - water was dripping heavily behind the
dashboard
and onto my new carpet. The lights worked but the wipers did not.
Nor did
the fan work, or the radio. I got home okay and pulled out the
carpets
(boy, that new padding is like a sponge!), disconnected the battery,
and
let it all dry out.
Today I thought I'd see if I could figure out what
may have happened. The
fuses all looked good, but again, no joy from the
wipers, radio, or fan.
As I sat in the driveway several minutes with the car
warming up,
pondering my plight, feeling dejected and defeated by my
ignorance, the
radio came on! I checked the fan - fine! The wipers - they
worked, too!
What do you suppose happened? It's a mystery to me, and I'm not
sure where
to look.
I am slowly learning about electricity, but it's a long
process. I've got
a fairly new GM alternator, wired into the "S/Brake" light
so that the
light goes out when the generator starts contributing (thanks to
some
Datsun guy who had a helpful website on the subject), and I put in a
little
digital voltage meter so I could corroborate with the light. The
battery
is a little over a year old. I cleaned the grounds to frame that I
knew
about, front and rear, and the battery to starter connections. That's
about the extent of my knowledge. It's the unknown that gets me.
If any of
you care to venture some explanations or suggestions of what I
could do to
make sure I don't run into this problem again, I would sure
appreciate it (I'm
definitely going to get the windshield reset).
Thanks.
John
--
John E.
Stromgren
SRL311-14061 (Red)
Portsmouth, NH
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