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I've been considering doing this on my '64, but it seems that the wiring is a PITA to get at. I would just use a pair of 555 chips and relays with the existing bulbs. Probably no more than $10 to do the job.
You are correct (but only one 555 required and no relays - I tried relays but are too slow). Note that it does require LEDs (incandescent bulbs "turn on" speed is too slow).
See below circuit:
Black Magic fixed the link to my video (see his website link in his #1 post).
I have the PCB (perf board) layout, etc., if any one is interested. The values for R1 (and R1A) are listed on the lower left of the schematic. One note on the schematic says "1N4002 diodes were used....". These are in ref. to the 2 1N4001 diodes shown in the schematic (in other words, 1N4001 diodes are fine for this application).
Note that I have been running this circuit in both my 03 and 62 Vettes since 2011, plus have it installed on friend's Vette, with zero issues.
Plasticman
Last edited by Plasticman; 04-26-2018 at 07:27 PM.
There was a problem with the original .mp4 file John sent me that caused it to fail on SOME version of browsers. I ran it through a converter .mp4 in .mp4 out and it cleaned up the problem.
If it does NOT work on your OLD browser
Try this link for 62 Vette (Plasticman) ===> Click Here
PO installed the extra tail lights in the 65 in late 60s. He used some homemade U brackets he made up. Not as nice as Magic's though. When I had the body repaired from an accident I had "buckets" added to replace the hardware used before. The inner lights now mount just like factory.
You are correct (but only one 555 required and no relays - I tried relays but are too slow). Note that it does require LEDs (incandescent bulbs "turn on" speed is too slow).
See below circuit:
Black Magic fixed the link to my video (see his website link in his #1 post).
I have the PCB (perf board) layout, etc., if any one is interested. The values for R1 (and R1A) are listed on the lower left of the schematic. One note on the schematic says "1N4002 diodes were used....". These are in ref. to the 2 1N4001 diodes shown in the schematic (in other words, 1N4001 diodes are fine for this application).
Note that I have been running this circuit in both my 03 and 62 Vettes since 2011, plus have it installed on friend's Vette, with zero issues.
Plasticman
Both systems are a bit fast for my taste.
I would run them slower and 555s/relays could be used (they operate down to milliseconds with the time is spent heating the filament). A partial current through a resistor could also be sent to the outter light when the inner light comes on, so the bulb is "pre-heated" when the relay fires it.
Remember that the original T-Birds/Cougars did it with incandecent bulbs.
With the provided circuit, it states that each LED assembly consumes 0.15 amp. The 555 chip can dissipate as much as 0.25 amp (250 milliamps) and the Darlington transistors may not be necessary if a pair of 555s or a single 556 chip were used. The 555s/556s are probably cheaper.
Alternatively, the Dartingtons could be replaced by a pair of relays using the single chip with just a bit of modification to the circuit, and this would retain the same timing between the two sides.
BTW, I think that the 0.1 mfd cap is shown in the wrong place. As shown, it is simply in parallel with the 100 mfd yielding 100.1 mfd. I'm thinking this should be on pin 5 and should be 0.01 mfd.
PO installed the extra tail lights in the 65 in late 60s. He used some homemade U brackets he made up. Not as nice as Magic's though. When I had the body repaired from an accident I had "buckets" added to replace the hardware used before. The inner lights now mount just like factory.
Tom
If Vette wasn't painted I would have went with the buckets BUT the simple brackets vs new paint job --- no contest
Remember that the original T-Birds/Cougars did it with incandecent bulbs.
they're a bit fast for me too, and John's seems to get faster as 'things' heat up...
the TBird/Cougar sequencers were done with an electric motor operated 'timer' for each set of lights. you could hear them run when the turn signal was operated...
they're a bit fast for me too, and John's seems to get faster as 'things' heat up...
the TBird/Cougar sequencers were done with an electric motor operated 'timer' for each set of lights. you could hear them run when the turn signal was operated...
Bill
My design can be adjusted to suit.....Simple single screwdriver adjustment on one pot (one pot, one timer that covers both left and right - which eliminates any differential from side to side). But the turn signal (electronic) flasher determines the base flash rate. The 555 chip just determines the offset of the 2nd light flash.
I believe that was the first version, which did not have the stability of the 555 timer chip.
John
Last edited by Plasticman; 04-27-2018 at 06:43 PM.
check the Trim Parts website. they are the inboard lights and there is a right & left. you're going to have to make your own U-bracket retainers as shown elsewhere in the thread.
Cool thread , 6 lights look good on the GS also. We are building two
with the sequential lights.Found these harnesses on ebay for 2008
mustang and up , has the sequencer built into the harness. Hope to
try them out in a few weeks.
If I do this I would forgo the sequential for backup lights like on the Impala. I think this is how GM would have done it and wiring wise it would be simpler.
If I do this I would forgo the sequential for backup lights like on the Impala. I think this is how GM would have done it and wiring wise it would be simpler.
that is a possibility that they might have been done that way, considering backup lights were an option; otherwise they would have been all red
04-26-2018, 05:07 PM
