Hazard Lights Hyper Flash Only with Engine Off
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
Hazard Lights Hyper Flash Only with Engine Off
Installed LED Switchbacks, Halo Taillights, and Hyperflash Harness about 7 years ago.
Everything functioning properly...until now.
When engine is off and I activate hazards, I get hyperflash. Only happens when engine isn't running.
Any ideas?
Everything functioning properly...until now.
When engine is off and I activate hazards, I get hyperflash. Only happens when engine isn't running.
Any ideas?
Drifting
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
Is the voltage dropping low when off? What happens if you cycle the hazard switch several times?
Last edited by Ed Ramberger; Oct 27, 2020 at 08:43 PM.
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
Have new garage now with electric and BT hooked up. It fully charged in about an hour. That's when I activated hazards again to see what would happen. Still got hyperflash. Tried it a few times.
Drifting
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
Interesting you mention voltage drop. I installed new Optima Red Top about a year ago. My garage has no electric so I can't use my Battery Tender, and I don't always drive my C5 on a regular basis. Past few months I've noticed voltage with key in ignition "on" at 11.7, and with engine running varies 13.6-14.2.
Have new garage now with electric and BT hooked up. It fully charged in about an hour. That's when I activated hazards again to see what would happen. Still got hyperflash. Tried it a few times.
Have new garage now with electric and BT hooked up. It fully charged in about an hour. That's when I activated hazards again to see what would happen. Still got hyperflash. Tried it a few times.
I don't know if a different LED friendly flasher would fix that. It might if the one in the harness is failing. You would just plug it into the harness - not buy a new harness. Maybe the flasher is on it's way out.
Last edited by Ed Ramberger; Oct 27, 2020 at 09:34 PM.
Drifting
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
I had hyperflash with the rear halos that had resistors only when voltage dropped to a certain point. I installed a hyperflash harness to remedy it. Remembering back, I think it happened once when the battery was low with the harness. That's why I asked. I asked about the switch to make sure the contacts are exercised. My thought was that you would see it when the voltage drops past a certain threshold.
I don't know if a different LED friendly flasher would fix that. It might if the one in the harness is failing. You would just plug it into the harness - not buy a new harness. Maybe the flasher is on it's way out.
I don't know if a different LED friendly flasher would fix that. It might if the one in the harness is failing. You would just plug it into the harness - not buy a new harness. Maybe the flasher is on it's way out.
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
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The flasher in the hyperflash harness is only used for the signals. The flasher in the hazard switch is still used for the hazards. Did your rear halo lights have load resistors? I've seen pictures of those melted and failed. Removing some of that resistor load or not having load resistors at all would cause the hazard flasher to hyperflash. Lower voltage might cause it to hyperflash too. There is probably nothing you can do about it, because a replacement hazard switch could even be worse.
Last edited by lionelhutz; Oct 29, 2020 at 05:07 PM.
Drifting
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
The flasher in the hyperflash harness is only used for the signals. The flasher in the hazard switch is still used for the hazards. Did your rear halo lights have load resistors? I've seen pictures of those melted and failed. Removing some of that resistor load or not having load resistors at all would cause the hazard flasher to hyperflash. Lower voltage might cause it to hyperflash too. There is probably nothing you can do about it, because a replacement hazard switch could even be worse.
I forgot about the flasher for the hazards being separate.
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
Thread Starter
Melting Slicks
Joined: Jun 1999
Posts: 2,263
Likes: 48
From: NJ
The flasher in the hyperflash harness is only used for the signals. The flasher in the hazard switch is still used for the hazards. Did your rear halo lights have load resistors? I've seen pictures of those melted and failed. Removing some of that resistor load or not having load resistors at all would cause the hazard flasher to hyperflash. Lower voltage might cause it to hyperflash too. There is probably nothing you can do about it, because a replacement hazard switch could even be worse.
Drifting
Joined: May 2008
Posts: 1,695
Likes: 490
From: Denver, NC
When I first got the car, before I replaced the battery, I noticed it when it was raining. Lights, wipers, radio, signal on, defroster and a long traffic light and once the voltage hit a certain point every time hyperflash.
Last edited by Ed Ramberger; Oct 29, 2020 at 08:16 PM.