1970 LT1 Hazard Flasher

[Fred S.]

I have an Ideal Corp. heavy duty flasher 536 HW 12 volt with a silver can.
The hazard lamps flash about twice as fast as when the turn signals are on and I received an NCRS deduct for this.
I believe that 536 is correct but it should have a gold can?
Can anyone confirm this and also let me know why the lamps might flash so fast with my existing flasher?
Thanks

[Don L.]

Re: 1970 LT1 Hazard Flasher

The 'HEAVY DUTY" aspect is what's giving you the faster-than-expected flash frequency. Heavty duty units were prescribed for trailering purposes, where a larger load was demanded.

Hope this helps...

[Terry M.]

https://www.forums.ncrs.org/showthre...41641&uid=7370

Had you titled your thread "1970 Hazard Flasher" you would have had four chances at a relevant thread. You squandered three "auto search" chances.

You can search for "1970 Hazard Flashers" or "C3 Hazard Flashers" and likely find more relevant threads. We have been around this block often in the past. You might even be able to find the thread which tells us the 1970-1972 TIM&JG is partly wrong in its flasher call-out. That thread was not all that long ago.

[Dave S.]

Re: 1970 LT1 Hazard Flasher

I have an Ideal Corp. heavy duty flasher 536 HW 12 volt with a silver can.
The hazard lamps flash about twice as fast as when the turn signals are on and I received an NCRS deduct for this.
I believe that 536 is correct but it should have a gold can?
Can anyone confirm this and also let me know why the lamps might flash so fast with my existing flasher?
Thanks

Fred,
I think what you describe is exactly what you should have. The silver can #536 is the correct flasher. You can remove it and check the date coding. They are stamped with that information. I don't know the reason why the hazard flashers blink so fast but that is the way they were designed.

[Patrick H.]

Re: 1970 LT1 Hazard Flasher

https://www.forums.ncrs.org/showthre...41641&uid=7370

Had you titled your thread "1970 Hazard Flasher" you would have had four chances at a relevant thread. You squandered three "auto search" chances.

You can search for "1970 Hazard Flashers" or "C3 Hazard Flashers" and likely find more relevant threads. We have been around this block often in the past. You might even be able to find the thread which tells us the 1970-1972 TIM&JG is partly wrong in its flasher call-out. That thread was not all that long ago.

Terry,

Neat feature. I had no idea it was there...
Too bad it's so far down the page.

Patrick

[Terry M.]

Re: 1970 LT1 Hazard Flasher

Yep, it is a real PITA to scroll down the page to find those "searches.'

If more of us knew it was there we might be more to the point with our thread titles.

[Patrick H.]

Re: 1970 LT1 Hazard Flasher

Yep, it is a real PITA to scroll down the page to find those "searches.'

If more of us knew it was there we might be more to the point with our thread titles.

I never use the "Quick Reply" box down below - just delete that and put the searches there instead.

Better yet, train the members to use the Search function.

Patrick

[Jack H.]

Re: 1970 LT1 Hazard Flasher

Typically, GM used TS flashers that were 'load rated' (2 lamps, 3 lamps, Etc.) so the blink rate would change when you had a burned out lamp telling you repair/maintenance was needed. Since an emergency flasher drives ALL of the vehicle's exterior lamps, they're typically designed differently to be lamp load insensitive.

The load sensitive flashers work on an RC time constant basis with the vehicle's lamp filament resistance providing the 'R' factor. That's why getting the right factory original lamps installed in these classic cars (vs. a modern service replacement lamp that's downward compatible) can make a difference on the judging field in the pass/fail assessment of an Operations Check or Performance Verification.

When it comes to hazard flashers, they generally don't care about the number of lamp loads they drive (typically rated 'up to' X lamps). They simply count time (ON/OFF) making their blink rate independent of the actual number of lamps they're driving and/or the lamp's specific filament resistance...

[Peter L.]

Re: 1970 LT1 Hazard Flasher

Fred - Flashers do fail and/or degrade over time and this will have an affect on the flashing rate (from zero if it fails to faster or slow). I suggest a quick check of the hazard flasher is to replace the 536 (which as others have pointed out is one of the OEM flashers used in 1971) with a new 552 (the 552 is a variable load flasher like the 536 and was also used in the hazard lamp systems) or a new 536 and see if the flashing rate of your hazard lights slows down. Wagner currents makes a 552 and many auto parts stores stock them. I don't know if 536s are still available. If the flasher change does have an affect in the rate, I'm sure we will see another posting for suggestions. Good luck. Pete

[Fred S.]

Re: 1970 LT1 Hazard Flasher

I went to Auto Zone and picked up a 'Blazer' FL552/536 Thermal Flasher, 11-15v, #20-1038-8.
Using this flasher, the hazard flash rate is now the SAME as the turn signal rate.
My plan now is to find an NOS or good used replacement 536 or 552.
Thanks to everyone for their help.

Fred Sarbello