[DeTomaso] Hazard Warning Switch Issues - Part 2

[SOBill at aol.com]

Chris,
 
In the OEM system, the turn indicator light  in the tach is wired in a fairly 
subtle way. The indicator lamp filament is  wired BETWEEN the left and right 
turn signal lamp power feeds. Whichever  direction you are turning applies 12V 
to one side of the indicator lamp and the  filaments of the turn signal lamps 
for the direction you are not turning provide  the ground path for the 
indicator lamp. This works because the indictor lamp  current is so low relative to 
the signal lamp currents that the signal  lamps which provide the ground path 
do not glow.
 
IF you have converted to an LED turn signal indicator lamp,  the indicator 
will not work correctly unless the wiring in this area is  modified by adding 
two diodes to feed the positive input to the LED  and adding a direct ground 
connection to the negative of the  LED.
 
A diagram of the required circuit modifications is posted at  
>>>>>www.members.aol.com/sobill/LED_Turn_Signal_Lamp_Indicator_Fix.pdf.
 
BTW, this circuit mod is needed if you use the OEM incandescent  indicator 
lamp with LED signal lamps. The LED signal lamps will ALL flash for  turns in 
either direction if the OEM indicator lamp is used without this  modification.
 
If you use LED's for the turn signal lamps, you will also need to  replace 
the OEM flasher with an electronic flasher which is not dependent on the  turn 
signal lamp currents to make it cycle.
 
Simple, ain't it?
 
Have fun,
 
SOBill  Taylor
sobill at aol.com  

 
In a message dated 11/17/2007 3:57:10 P.M. Pacific Daylight Time,  
cdifani at pacbell.net writes:

Guys:

Since I wrote my previous email a few moments ago, I found  the schematic for 
the switch, and "just for fun" checked the wiring that was  plugged in.... 
And I found that the "Light Blue with black stripe" wire was  plugged on to the 
"Light blue" (R) connector, and visa versa.

This may  be a significant part of my problem.... I hope. 

Chris

Chris  Difani
'73 L #5829 "LITNNG"
The Electric Pantera
Sacramento,  CA
Email: cdifani at pacbell.net  

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