1980 C70 Passport, headlight and wiring issues

Dan Stephens

New Member
I have a 1980 C70 Passport that keeps blowing headlights. From reading elsewhere here I see that it is probably my voltage regulator blowing the bulbs. It gets brighter and more dim as you accelerate/brake. Here are a couple of other issues I’m having with the headlamp/ electrical system.
Since each NOS bulb is $43 and 3 weeks to get it here. Here are my 2 questions,
1. Why would the headlamp and taillight flash with the blinkers now that the bulb is replaced?
(I’ve downloaded a wiring schematic to make sure I reinstalled the wires correctly. Everything looks right in the headlight cavity.)
2. Would it be possible to install a 6v LED into the system if I can find a headlight assembly that takes insert bulbs instead of a whole headlamp?
 
I have a 1980 C70 Passport that keeps blowing headlights. From reading elsewhere here I see that it is probably my voltage regulator blowing the bulbs. It gets brighter and more dim as you accelerate/brake. Here are a couple of other issues I’m having with the headlamp/ electrical system.
Since each NOS bulb is $43 and 3 weeks to get it here. Here are my 2 questions,
1. Why would the headlamp and taillight flash with the blinkers now that the bulb is replaced?
(I’ve downloaded a wiring schematic to make sure I reinstalled the wires correctly. Everything looks right in the headlight cavity.)
2. Would it be possible to install a 6v LED into the system if I can find a headlight assembly that takes insert bulbs instead of a whole headlamp?
My guess is your battery needs replacing. If your battery is good, I suspect your voltage regulator/rectifier. The charging system charges your battery, but if your battery can't accept the additional juice, it'll start blowing bulbs. One trick you can try is to take one of your blown headlights and with a dremel, cut a hole so that a universal automotive double contact tail light recepticle can be inserted in the hole. Then just use a 6 volt tailight bulb as a headlight. If it blows, you're only out a couple of bucks. I did this to my neighbor's CT110 and used a 12 volt LED tailight bulb which will never blow and is still pretty bright even at 6 volts. Using your wiring diagram, try tracing the turn signal wiring, especially the rear, as well as the tailights, verifiying the green wires (grounds) are all good.
 
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