Electronics 2000

Hi, it's my first post and I need some help.
About me. I work in a car garage doing light conversions on American cars, the systems on these cars are increasingly difficult to fool with out blowing up any components.
One of the biggest issues we have is that cars are now using reduced voltage systems so you have a single filament bulb and the car sends say 6-8 volts down a wire for position light then sends a full 12 volts down the same wire for the indicator.
Is there any component like a pass through diode that would block the 6-8 volts and allow 12volts through it so I could use the front indicator feed and rewire it through a relay for the back turn signal feeds?

As most American cars use a signal lamp on the rear for turn signals, stop and tail lights we have to use the front indicators as a signal for the relay we wire into the car for the separate rear turn signals. As the newer cars have an amber parking light and turn signal on the front it's not ideal to use the front signals for reference to the relay as it will power up even though the parking lights are on.

Thank you for all your time.

Richard

Why not disconnect the front parking light and use the front indicators to switch the relay?
Not sure how the front parking light is wired so can't advise how to rewire it to its own relay.

You say sends a voltage down a wire... There is a voltage between two points, it cannot be sent anywhere, a current flows through a wire. You will be shot in college or uni for that.

Tar&stuff.

Thanks for your reply, you can't disconnect the parking light feed, most cars lighting is controlled by a body control module that switches the voltage (current) I didn't know if there was a diode or some other device that was able to block the low voltage (current) and pass through the 12v.

Please help.

Voltage and current are two different things. Voltage/potential difference/electromotive force are measured in SI units of volts...current flows through a conductor or wire voltage does not.
There must be a sensor which switches parking lights on maybe via a relay or module if you find it and disconnect it your problem is solved.

Alternatively you could use aa AD converter to switch a digital simple digital chip when the voltage changes between the two values, use the chip output to switch a transistor or relay.

Tar&stuff.