Turn Signal

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Jun 13, 2022 | 09:26 PM

DiamondDave1984

Thread Starter

5th Wheeling

Joined: Oct 2016

Posts: 45

Likes: 6

Turn Signal

2020 F350 CC PS. Left turn signals blinking fast like a bulb is out but ALL bulbs are working. Any ideas??? Thanks

Jun 13, 2022 | 10:25 PM

Ltngdrvr

Lead Driver

Joined: Nov 2005

Posts: 8,459

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Any LED bulbs?
When the amp draw that is too low, the flasher circuit doesn't operate properly.
Or, if some connection is loose, it could cause this too.

Jun 14, 2022 | 06:52 AM

Poncho450

Lead Driver

Joined: Oct 2014

Posts: 5,940

Likes: 1,355

From: NY/Canada border

There have been a few instances reported here lately where a brake light has burned out and caused this issue.
People see that their turn signals are all working but somehow overlook the brake light bulb. Have someone step on the brake and check that.

Jun 14, 2022 | 08:48 AM

KeystoneF350

Tuned

Joined: Feb 2020

Posts: 432

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Do you have a trailer hooked up when this happens? I've had this issue when trailer lights weren't working correctly and caused the rapid flash on the truck.

Jun 14, 2022 | 06:18 PM

DiamondDave1984

Thread Starter

5th Wheeling

Joined: Oct 2016

Posts: 45

Likes: 6

No LED’s that I know of.

Jun 14, 2022 | 06:31 PM

DiamondDave1984

Thread Starter

5th Wheeling

Joined: Oct 2016

Posts: 45

Likes: 6

Well, lower brake light is OUT!!!! Thanks for that tip. Will replace tomorrow and verify. Thanks guys!!!

Jun 15, 2022 | 07:13 AM

Poncho450

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Joined: Oct 2014

Posts: 5,940

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From: NY/Canada border

Quote:

Originally Posted by DiamondDave1984

Well, lower brake light is OUT!!!! Thanks for that tip. Will replace tomorrow and verify. Thanks guys!!!

I've seen a few reports of this on the forum recently. With everything being run by various control modules I guess you never know what the heck is going to happen.