can the 6V tester be used for twelve volt? What changes would be needed to test 12V coils?
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You should do fine by using a 12 volt battery and coil.
I'd do the check real quick, as the relay is made for 6 volts, so you don't want to overheat it.
Last edited by Tom Wesenberg; 02-18-2018, 04:12 AM. -
The electronics surplus store where I bought the relay has been torn down, and so far I haven't found another matching relay.Originally posted by 2manycars View Post
I'll check the last remaining electronics surplus store in our area when I go to the store today.
A vibrator from an old 6 volt radio should also work in place of this relay. I'll see if I can find a schematic for one.
Coil Tester 1.jpgCoil Tester 3.jpgComment
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The surplus store had nothing, but I just found these on ebay, and they should be perfect for the job.
You could solder the wires to the pins, or do it the right way and buy an OCTAL socket for it.
If you have a junk old radio or TV, they also usually have octal tubes and sockets.
https://www.ebay.com/itm/DPDT-12-Amp....c100033.m2042
Last edited by Tom Wesenberg; 02-18-2018, 04:12 AM.Comment
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I ordered the relay and cap from the internet.
Thanks for the replyComment
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My relay has 35 ohms, and with this capacitor it makes the relay vibrate at a rate equal to an engine running at 1000 RPM.
I also bought 2 more of these relays and sockets that I just gave the link to, so when they come I'll measure the ohms.Comment
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My relay and socket came the other day, and they are the perfect replacement for the original tester I built, but can't find the exact relay.
Here's a picture showing how the contacts are wired inside the relay cover.
It's a heavy duty Potter & Brumfield relay with almost the same ohms as my first build.
It was a tight push into the socket, so I used a small screwdriver to push on the center of the socket, so as not to put pressure on the metal tabs.
Relay Coil Tester Potter and Brumfield.JPGLast edited by Tom Wesenberg; 03-03-2018, 03:21 PM.Comment
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Helped a mate with an electronic Efire crab dizzy today.
Would not go, after a couple of hours we found 2 things wrong.
Firstly the magnet drum had to be pushed right home to work and we could not get a 3 ohm coil to run.
Got it running on a 1.2 ohm coil.
Whether the 3 ohm one is dead or electronics don't like 3 ohms.
12 volt...12-24-2018, 12:50 AM -
Found this little dwg. on the net for checking coils polarity other than the conventional lead pencil test and the vendors' tester. No specificity for 12 volt neg. vs 6 volt pos. systems....11-24-2017, 01:32 PM -
When alexiskai came to visit a couple weeks ago, he showed me his Snap On coil tester and also told me about an old school Herbrand coil tester. I then wanted one of my own
After some searching I found a rough and non-working Herbrand tester. In the Chit Chat forum I discussed the Herbrand tester and how I refurbished it.
Putting it to good use, 3 coils were tested. One was an original...08-18-2022, 07:56 AM -
I am looking for some guidance on testing a 6 volt coil with an analog meter. I presume side post to side post will check the primary windings but what should be the setting on the analog meter and what range of numbers constitute an acceptable reading? Almost the same question with regard to checking the secondary windings. I presume side post to center is proper but which side post and what constitutes...06-11-2017, 02:07 PM -
COIL TESTER
Coil Tester
By Tom Wesenberg
Here is a coil and condenser tester I made for about $9. The 6 volt relay is 35 ohms and the capacitor connected to the relay windings is 330 microfarads. This combination makes the relay vibrate at a rate to give the coil the same frequency as a Model A running at 1,000 RPM. The higher the capacitance, the slower the relay...08-06-2018, 07:21 AM -
HELLO I HAD A PROBLEM WITH A ELECTRONIC DISTRIBUTER SO CHANGED IT TO A POINT DISTRIBUTER . EVERYTHING WAS FINE FOR A WHILE THEN THE MAIN FUSE BLEW OUT AND THE COIL BURNED OUT . I PUT A GENERIC COIL IN IT AND IT WAS GOOD FOR ABOUT A 100 MILES AND IT BURNED OUT ALSO. IS TERE SUPOSE TO BE A RESISTER IN IT?. I AM USING A 12 VOLT SYSTEM WITH A ALTERNATER. THANKS08-15-2021, 12:36 PM -
Today I changed out my coil to the flame thrower 40111. My electric tachometer is hooked up to the coil. Now my tac is showing fast for some reason. Any idea why.09-09-2017, 07:11 PM -
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some info says the plus is where to check the high voltage, and another says use the minus. I also have seen wiring diagrams showing comman internal connection on both plus and minus. Are different coils wired differently to the + - terminals? Also, I get the same ohm reading from the hi tension tower to either plus or minus. This is on several coils that spark well.
which terminal is the power...10-15-2018, 09:11 PM -
First Street Ignitions (FSI) says to use a coil with 3 to 31/2 oms internal resistance. I bought a coil on Ebay to carry as a spare. It measures 6 oms internal resistance. Is this going to work? Second question, Where can I get a good set of cables ? The last set that I bought I had to cut the rubber back to get them to go over the spark plugs. Thanks Bob02-02-2023, 09:00 AM
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