Why does my left turn signal work without the brake on but once I apply the brake, it does not work? Options

[914xr75]

So when I’m just turning left without applying the brakes, the front and back turn signals work as they should. With the brake applied the turn signals do not blink.

The right side works correctly. It’s a 1973 model.

I did install the Spoke led front turn signal boards but I’m not sure if it did the same thing before the LED change. I only noticed because a car behind honked at me when I was turning left.

Any ideas for this problem would be appreciated.

[Spoke]

So when I’m just turning left without applying the brakes, the front and back turn signals work as they should. With the brake applied the turn signals do not blink.

The right side works correctly. It’s a 1973 model.

I did install the Spoke led front turn signal boards but I’m not sure if it did the same thing before the LED change. I only noticed because a car behind honked at me when I was turning left.

Any ideas for this problem would be appreciated.

Installing LEDs in turnsignals and brakes won't cause any strange issues unless there are some socket or wiring issues. LEDs will tend to accentuate any wiring/socket issues.

Quick question: are the brakes incandescent or LED?

The brake light is a combination of running light and brake (dual filament). Likewise the front turnsignal is also dual filament with running light and turnsignal.

If the ground is lost on the brake bulb it can cause the running light to power via the brake light through the running light.

Ground can be lost on a bulb if the socket and/or bulb base are oxidized. A good cleaning with a small screwdriver to scrape the socket sides and power buttons. Do not press hard on the power buttons.

Try this test: remove the brake bulb and see if the turnsignal stops when the brake is applied.