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I am in the process of working some bugs out of my 1991 Mustang GT and would appreciate any input.

I turn the headlights on and I have NO tail lights. If I pull the switch back half way between off and on , everything comes on (ie. headlights/tail lights/dashlights).

I have ruled out a bad switch by trying 4 different ones.

The car has an aftermarket ECU(Gen7), a few electric accessories, and some gauges.

Any suggestion where I can start my search with the headlights/tail lights acting like described?

Thanks
PK
 

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It's been a while since working on one but I do recall the multifunction switch (turn signal switch on column) being an integrated part of the vehicles lighting. Replaced a few of them due to weird lighting problems.

Pic found online for ya.

87-89 are different then 90-93 pic is of a 92.

 
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