Flyback Voltage Spikes Emitted From an Unprotected Relay

  • Thread starter CAMTWO
  • Start date
  • #1
CAMTWO
2
0
TL;DR Summary
Had an issue with electrical gremlins and blown sensors also 3 ECU's after buying a wiring harness from a Veteran in the industry. Back when this guy started Flyback wasnt even considered and besides the harnesses are installed in kitcars and hotrods built all around the world.All these wiring kits are plagued by flyback emitted from the huge amounts of cheap unprotected diodes they utilize. My ECU expert said I was spiking the heck out of my ECU with flyback due to lack of circuit protection
I research the phenomenon and came up with the fact they weren't using protected diodes in their relays they utilize in a multitude of wiring harnesses for cars and also go into factory built kitcars in massachusettes..

I was having huge issues and have accrued over $1000 in blown sensors and ignition modules and ECU's..wiring harness guy said it was my install skills ... Its his electrical engineering skills that come into question here.

I bought the protected relays and the problems instantly went away as fuelpump relay,horn relay,power doorlocks and power windows also door poppers and trubk popper ,ecu relay,starter solenoid and fuel injectors were the issue causing the flyback through a relay block with cheap chinese relays that are unprotected by a schottky diode.

Now I am trying to save people from headaches as well as lives from being lost and I am being banned from forums like some crackpot spreading false news but its the wiring guys that sell these kits getting me banned.This is a fact and my 1st Amendment rights are being violated too. I need a Good civil rights attorney too if anyone knows one..
 

Attachments

  • IMG_20211216_232425.jpg
    IMG_20211216_232425.jpg
    57 KB · Views: 43
  • Screenshot 2021-12-16 180128.jpg
    Screenshot 2021-12-16 180128.jpg
    27.5 KB · Views: 43
  • Screenshot 2021-12-17 040835.jpg
    Screenshot 2021-12-17 040835.jpg
    36.7 KB · Views: 39
  • Screenshot 2021-12-17 040953.jpg
    Screenshot 2021-12-17 040953.jpg
    42.8 KB · Views: 41
  • Screenshot 2021-12-17 200034.jpg
    Screenshot 2021-12-17 200034.jpg
    77.5 KB · Views: 49
  • Screenshot 2021-12-18 135941.jpg
    Screenshot 2021-12-18 135941.jpg
    33.7 KB · Views: 37
  • Screenshot 2021-12-18 131743.jpg
    Screenshot 2021-12-18 131743.jpg
    34.7 KB · Views: 42

Answers and Replies

  • #2
CAMTWO
2
0
Heres the schematic for the relay..They double up on soma and triple up on another circuit and feed 3 with 1 relay and with a subpar 15 amp fuse too.

They say I am the guy whos creating the issues...

What does the experts say about this?
 

Attachments

  • Screenshot 2021-12-17 225949.jpg
    Screenshot 2021-12-17 225949.jpg
    33.7 KB · Views: 38
  • s-l500.jpg
    s-l500.jpg
    17.5 KB · Views: 38
  • Screenshot 2021-12-17 225524.jpg
    Screenshot 2021-12-17 225524.jpg
    38.8 KB · Views: 36
  • Screenshot 2021-12-17 225854.jpg
    Screenshot 2021-12-17 225854.jpg
    70.3 KB · Views: 39
  • Screenshot 2021-12-17 225949.jpg
    Screenshot 2021-12-17 225949.jpg
    33.7 KB · Views: 39
  • Screenshot 2021-12-18 131743.jpg
    Screenshot 2021-12-18 131743.jpg
    34.7 KB · Views: 40
  • #3
Baluncore
Science Advisor
12,339
6,404
What do you expect PF to do about it?

When the relay coil is close to the driver on a PCB, it is easy to place a flyback diode. But when they are far apart, the diode needs to be with the driver where the polarity is known, with a twisted pair to power the remote relay coil.
 
  • Like
Likes Averagesupernova and nsaspook
  • #4
Averagesupernova
Science Advisor
Gold Member
4,272
1,061
I find this rant a bit on the silly side. If someone in some industry has 'issues' that are causing so many problems in said industry, then come up with a better product. I'm not tell you to go pound sand, just realize that many times problems like these go on for years since not everyone involved is smart enough to realize why the failures are occurring. I have to assume that you are a builder of custom cars/street rods. Since you now realize what is happening, the ball is in your court. Make builds with equipment that doesn't cause the issue. Your reputation as a builder of a quality product will rise.
-
Also realize that many many automotive relays have no flyback protection. The circuit that drives them is taking the task of suppressing the spike generated by the falling field in the relay coil. A flyback diode built into a relay can be a risky thing for the amateur to be messing with since a reversal of polarity will fry the diode and may blow the output device that is driving it. Coming on here explaining about flyback as if it is a new thing is like me coming out with big news about how people get wet if they don't come in out of the rain. If you couldn't tell, I used to work in the automotive electronics industry.
 
  • #5
berkeman
Mentor
64,441
15,789
What do you expect PF to do about it?
Exactly. This jerk newbie already had his first attempt at this thread start deleted with a similar message, and this repost of a deleted thread earns this newbie a permanent ban from PF. Thread is locked.
 

Suggested for: Flyback Voltage Spikes Emitted From an Unprotected Relay

Replies
11
Views
753
Replies
4
Views
181
Replies
1
Views
388
Replies
7
Views
476
  • Last Post
2
Replies
37
Views
2K
Replies
3
Views
497
  • Last Post
Replies
5
Views
472
  • Last Post
Replies
9
Views
568
  • Last Post
Replies
21
Views
539
Replies
26
Views
928
Top