(Topic ID: 219028)

So confused.. LED Polarity in the 12v Flasher not working but looks ok


By Junglist

10 months ago



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  • 7 posts
  • 4 Pinsiders participating
  • Latest reply 10 months ago by robm
  • Topic is favorited by 1 Pinsider

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#1 10 months ago

Hi, I'm troubleshooting my balrog flasher in my LOTR. I thought I had it figured out that the LED wasn't working as the polarity was incorrect to the socket. I took the following pictures and on analysis I now think it looks like its wired correctly. I'm hoping someone can advise if it's wired incorrectly or if there's something else going on. The following are my troubleshooting steps/results:

Issue: new LED bulb not working in 12v Flasher socket (Balrog)
1) new LED bulb works fine in AC GI lighting slot = bulb works
2) new LED bulb works fine wtih 9v battery (+) on nub and (-) on base but doesn't light when reversed = polarity sensitive bulb
3) Red GI lighting bulb i had works in flasher socket during tests = flasher power is working

The following pics show the black/grey wire (driver) going to the black wire in the molex connector. Then the pic of the socket shows the black on the nub which appears correct. So I'm out of ideas if thats correct....?!

I also looked at the service bulletin and it looks correct - I assume the wiring harness has been redone once, so my red/black are instead of the orange/black: http://www.sternpinball.com/upload/downloads/sb148.pdf

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#2 10 months ago

According to the manual, balrog uses an 89 flash bulb, which runs off 20v dc. My guess is you don’t have the proper bulb. I have never been inside my balrog so not sure what’s in ther, just going by what manual says it should be. You sure you have the right socket?

Should have a blk-gray wire on the socket.

That’s not factory soldering on that socket, maybe previous owner replaced it with the wrong socket.

#3 10 months ago

Ya it's the Service bulletin http://www.sternpinball.com/upload/downloads/sb148.pdf that changes it to a #44 base socket for a LED. It's done by the previous owner and now that I've traced it, it looks like it's all correct. Which is why i'm so confused.

#4 10 months ago

I don't have my LOTR nearby to check, but we commonly get complaints that some LED flashers don't work in this socket. I'm not sure I understand the reasons 100%, but swapping the which wire goes to which lug on the socket seems to resolve it.

#5 10 months ago

Thanks - that's what I'm thinking. If I had an AC rated bulb it would be fine but since it's DC I need to swap the wires to the socket I guess. I was just concerned that maybe swapping the wires would cause some other issue, but sounds like it's fine.

#6 10 months ago

No issues if you swap the wires...many have done it

#7 10 months ago

Yep, swap wiring. Had this issue with a whitewater i just restored. Had an LED that worked in other sockets but not the 2 insanity falls ones, after swapping drive transistors and boards and everything, i finally realised the factory wiring was back to front - didn't matter for an incandescent flasher, but it did for an LED. If it was wedge, you could turn the bulb around 180 degrees, but being bayonet, this makes no difference.

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