On the 69 Shelby, does anyone repair the rear turn-light sequencer circuit boards?
Quote from: kasearch@ix.netcom.com on August 01, 2024, 09:43:34 AMOn the 69 Shelby, does anyone repair the rear turn-light sequencer circuit boards?
I am not sure because the cost most likely would be more then a nice used working sequencer . There are various aftermarket replacements that can be wired into the case. Check Branda . If you want a nice working sequencer PM me.
Vic Yarberry at Cougars Unlimited might be able to. He sells very good reproduction boards with the correct electrical connectors, which look original when installed inside the black case in the trunk. I installed his LED system and circuit board.
Vic stands behind his products. I emailed him a month ago about some flickering LED tail lamp bulbs I bought from him and installed in 2015. He sent me 4 LED bulbs for free and didn't even charge me for shipping.
http://www.thuntek.net/cougars_unlimited/ts1promo.htm
I went electronic/LED many years ago when the sets got released and that is what I recommend. Brighter and no more failed boards(I've had a few over 30 years)
Quote from: shelbymann1970 on August 01, 2024, 11:51:59 AMI went electronic/LED many years ago when the sets got released and that is what I recommend. Brighter and no more failed boards(I've had a few over 30 years)
That was 2015 Gary. I bought my LED kit within 2 weeks of you buying the kit from Vic. I bought off his eBay site Barganspot.
https://www.ebay.com/sch/i.html?_dmd=2&iconV2Request=true&_ssn=paulson_kim&store_name=barganspot&_oac=1&store_cat=7290380
Quote from: 69 GT350 Vert on August 01, 2024, 11:44:50 AMVic Yarberry at Cougars Unlimited might be able to...
Depending on what has failed, the OEM circuit boards may be able to be repaired.
Many times the copper on the circuit board is corroded beyond repair by water entering the rear quarter.
If the board is intact, the typical failure points are:
1. Glass diodes - the larger germanium diodes fail open - check with a DVM.
These diodes can be replaced with a 1N34A diode.
2. Power SCRs - these transistors fail open, shorted, or with degraded specs.
These SCRs can be replaced with a C106B1 (higher voltage).
Use parts with a TO-202 case, some replacements use a TO-220 case, which does not fit on the heatsink.
3. 8-pin Hybrid module circuit - the internal transistors can fail.
A replacement part is not available - transplant a known good part.
4. Relays - found only on later service parts; the internal contact arm breaks off inside the OEM Littelfuse relays.
Replace with a Ford horn relay, C4AZ-13853-A.
5. Bad connectors
Replacement connector pairs are available from Cougars Unlimited.
Note: the internal circuit diagram shown in the factory wiring diagrams is incorrect.
Ford used two different versions with some minor differences.
Generally, the amount of labor time and difficulty obtaining the components, may make these repairs cost ineffective. Also, modern high-power "Plasma" LEDs cannot be used with the OEM boards. The latest generation replacement boards eliminate the voltage drop (and bulb brightness loss) inherent with the SCR transistor-based OEM sequencer.
LMK if you have any questions.
Vic Yarberry
Cougars Unlimited LLC
Welcome Vic!
- Phillip
Thanks Phillip!
I've been registered for many years and finally read a post to which I could respond with some useful information.
Quote from: 69 GT350 Vert on August 01, 2024, 11:57:07 AMQuote from: shelbymann1970 on August 01, 2024, 11:51:59 AMI went electronic/LED many years ago when the sets got released and that is what I recommend. Brighter and no more failed boards(I've had a few over 30 years)
That was 2015 Gary. I bought my LED kit within 2 weeks of you buying the kit from Vic. I bought off his eBay site Barganspot.
https://www.ebay.com/sch/i.html?_dmd=2&iconV2Request=true&_ssn=paulson_kim&store_name=barganspot&_oac=1&store_cat=7290380
When you did the conversion did you do all exterior lights or only taillights?
Pete
For those reading I have collected a number of the factory sequential boxes that I have confirmed working by installing on a car that if you are interested contact me by PM for the nominal fee. This is not the place to post a for sale part.
I have been troubleshooting the 68-70 Sequentials for many years now. I have no parts to sell, but can be of help if you wish.
I used to sell a replacement circuit board with adjustable segment speed, but that was 20 years ago.
Quote from: cob428 on April 27, 2026, 09:42:47 AMQuote from: 69 GT350 Vert on August 01, 2024, 11:57:07 AMQuote from: shelbymann1970 on August 01, 2024, 11:51:59 AMI went electronic/LED many years ago when the sets got released and that is what I recommend. Brighter and no more failed boards(I've had a few over 30 years)
That was 2015 Gary. I bought my LED kit within 2 weeks of you buying the kit from Vic. I bought off his eBay site Barganspot.
https://www.ebay.com/sch/i.html?_dmd=2&iconV2Request=true&_ssn=paulson_kim&store_name=barganspot&_oac=1&store_cat=7290380
When you did the conversion did you do all exterior lights or only taillights?
Pete
I did the tail lights and LED front turn signals from Vic. Huge improvement if you drive the car.
Another benefit of using the LED bulbs is a much lower load on the turn signal switch.
Quote from: Krelboyne on April 27, 2026, 12:49:39 PMAnother benefit of using the LED bulbs is a much lower load on the turn signal switch.
Very true. That is why I switched to LED lights in my Lucas fog lights as well. Huge draw reduction.