QUOTE(markb @ Apr 7 2007, 10:39 AM)
I don't think the later cars are wired for 2 signals on the tach. How are you going to make that work?
The turn signal indicator light and parking brake indicator are on the same relay. I'll just disconnect the turn signal indicator light.
Since the front and rear turn signal lamps are connected in parallel, I'll just connect the new R & L turn signal dash lamps in parallel with them. This way when a turn signal is on, the proper indicator lamp will flash.
The early cars had some strange arrangement with the L & R indicator lamps such that each lamp has one connection to the front and rear turn signal lamps, and the other side of the lamps were connected together and connected to the flash unit. The flash unit was supposed to pull the common connection of the indicators to ground when the turn signal was on.
On my 71, this common connection in the flasher was not working when I purchased it and both lamps would flash at 1/2 brightness when either turn signal was on. After coming to the conclusion that the flash unit was faulty, I simply disconnected the common connection from the flash unit and attached it to ground.
I'm not sure what function I disabled with the move of the common connection but things seem to work ok and nothing fried.
Spoke