Bill, this schematic helps.
http://www.311s.org/PDFs/1969-70%20Datsun%20SP%20L_R%20Sports%20Wiring%20Schematic%20rev0.pdf
If that doesn't work then go to the 311s.org pmwiki tech section and under
electrical go to Schematics: Wiring Diagrams.
The R/B wire is the brake/turn signal on the 69 & 70's. The G/W is the
running lights. Black is ground. The R/B should be hot for either the
brake or the turn signal. Bad grounding will cause odd things to happen.
Also all of these wires pass through the emergency flasher switch. I've had
a bad switch that cause weird things to happen.
Richard
----- Original Message -----
From: "Bill Schairer" <wschaibe@ucsd.edu>
To: "Datsun Roadster" <Datsun-roadsters@autox.team.net>
Sent: Sunday, August 17, 2008 3:17 PM
Subject: [Roadsters] brake light problem
>I need help with my right hand brake lights. I may be blind, but I
> cannot find the brake light switch on any of the wiring diagrams. That
> being said, I have a red/white wire for left brakes and left turn
> signal and a black/white wire for right brakes and right turn signal.
> Three wire plug from the firewall has the red/white, the black/white
> and a green. With brakes depressed, red/white is hot and black/white
> is not. With right turn signal on the black/white gets juice. If I
> splice in juice to the black/white from the brake switch, I get all
> brake lights on right and left but then my right turn signal does not
> work properly - it doesn't flash and juice goes to right and left.
> Left turn signal continues to work properly thru all. In current
> status, all lights work properly but the right brake lights. This is a
> 1970 1600. Can anyone help me out?
>
> Bill
> San Diego
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