Turn signal (blinker) wiring diagrams please?

No. There is no programming for this as it is basically just a fuse box.

It sounds like you either have a bad ground or low circuit voltage.

I would test your battery ground to the motor, frame and body and then test your lighting ground. You should read 0.04 ohms at each location.
The ground locations are noted in the diagram below. There are 4 in total.

Also test the voltage at the battery while running. This should be around 14.5 volts. If it reads 13 or less your voltage regulator had failed.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

I would do an alternator check here is a guide to help you.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Check out the diagrams (Below). Please run this test and get back to us.

Rich

That's okay. No they will not check this. If you like I can explain how to do it and you will need to buy a multi-meter for about $25.00. If not a shop would need to test this.

Rich

Hi,

It could be the turn signal flasher relay contacts are wearing and causing resistance this will slow down the flashing when the system takes on more load like turning on the head lamps. Check all the exterior lights be sure they good and bright like they should be a blown bulb or poorly lite bulb will indicate an electrical problem in the power or ground circuit. I'm attaching repair guides and turn signal flasher relay location below. Let us know if you need more information for this problem and we will get for you.

https://www.2carpros.com/articles/turn-signals-not-working-blinker

Thank you

If the alternator tests okay I would try replacing the flasher, it would be difficult to test the flasher.

No it isn't. The power for the bulbs goes through the flasher. If you unplug it they wont work at all.