 Why does my left turn signal work without the brake on but once I apply the brake, it does not work? |
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| 914xr75 |
 Dec 9 2025, 10:53 AM
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#1
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Member  Group: Members Posts: 202 Joined: 24-March 18 From: Whittier, CA Member No.: 21,996 Region Association: Southern California  |
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. |
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Replies(1 - 5)
| windforfun |
Dec 9 2025, 11:34 AM
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#2
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Advanced Member Group: Members Posts: 2,076 Joined: 17-December 07 From: Blackhawk, CA Member No.: 8,476 Region Association: None 
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You might want to reverse the previous surgery. Maybe. IMO, you have to test your changes ASAP.
Happy holidays. (IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/beer3.gif) (IMG:style_emoticons/default/beer3.gif) |
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| DC_neun_vierzehn |
Dec 9 2025, 12:03 PM
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#3
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Senior Member Group: Members Posts: 610 Joined: 16-November 20 From: Coastal Delaware Member No.: 24,893 Region Association: MidAtlantic Region
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QUOTE(914xr75 @ Dec 9 2025, 11:53 AM)  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. I have a similar issue going on with my front turn signals and parking lights. It happens intermittently - when I'm pulling up to a red light and I'm behind another car, I can see in the reflection of the car in front of me that when I tap the brakes, the parking lights in the turn signal housing go out. When I take my foot off the brake they come back on. Then at other times, the parking lights will stop working while I'm driving and don't come back on (doesn't appear to be effected by braking). I have a hard time re-creating this issue at home in my garage so it's not been easy to resolve. I think I will make it my #1 winter project while it's off the road for a few months. I'll let you know if I have any luck. |
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| Ishley |
Dec 9 2025, 01:11 PM
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#4
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Member Group: Members Posts: 309 Joined: 4-October 21 From: Clarendon Hills Il Member No.: 25,957 Region Association: Upper MidWest
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Call the spoke guys to see what they say. Here is my thoughts… others may have different ideas.
In general… the LED lights in turn signals draw a lot less power. This affects the flasher… as the flasher technology uses the power to trigger. When your brake lights are off there is enough power going thru the circuit and the flasher pulses correctly. When the brake lights come on… its drawing power over to those lights and away from the turn signals circuit. The flasher then no longer has enough power to pulse. There is a fix… you can search for it. It involves changing the flasher. |
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| Ishley |
Dec 9 2025, 01:28 PM
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#5
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Member Group: Members Posts: 309 Joined: 4-October 21 From: Clarendon Hills Il Member No.: 25,957 Region Association: Upper MidWest
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| Dave_Darling |
Dec 10 2025, 02:52 AM
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#6
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914 Idiot Group: Members Posts: 15,301 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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You've got one of the turn signal buckets mis-wired. Could be front, could be rear.
Time to dig into the LED swap you did and carefully check where everything is hooked up. --DD |
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