Ignition Coil Resistance Values

Pootcrum · Post by **Pootcrum** » Sun Aug 15, 2010 6:47 pm

Hi all,

This is an offshoot of a thread I made over in the chat regarding a power issue I am trying to solve in my 91 Brumby.

I have my suspicions over my ignition coil and whether it is time for replacement. People often say that if it fires it is ok, but as I understand it, it could fire great half the time and then intermittently for some time after that if the coil is on its way out. So I have read the most definitive test is to measure the resistance of the primary and secondary windings and if they lay outside of the manufacturers recommended values, then it should be replaced.

So my coil had 1.4ohms on the primary and 11.8kohms on the secondary. Problem is I have no idea what the recommended values should be as I have no documentation. And these values change depending on the coil, but I think it is usually ~1ohm prim. and 10-11kohm sec.

For those that own one, are these values in the FSM and if so would you kindly note them here?

Failing that, if anyone has a chance, what resistance values do people measure on their coils, assuming you have the same OEM coil. It is a Diamond Electric E-019 12 V coil with no ballast resistor.

Cheers for any help!

RSR 555 · Post by **RSR 555** » Mon Aug 16, 2010 3:31 pm

Sorry I don't have my FSM handy but hopefully someone else might have one

But you can try one of these to test your coil strength..
http://www.toolfetch.com/Category/Autom ... THE404.htm

Pootcrum · Post by **Pootcrum** » Mon Aug 16, 2010 5:09 pm

Yep I am holding out for someone to have one handy. I wonder what the likelyhood is that its the same coil used on the EA82 and whether that manual would suffice. As that one is online, the EA81 is not in its entirety.

RSR 555 · Post by **RSR 555** » Mon Aug 16, 2010 6:32 pm

As long as your Brumby has electronic ignition then the EA82 coil will be fine.

Pootcrum · Post by **Pootcrum** » Mon Aug 16, 2010 7:36 pm

Hmm ok I think I read that all Brumbys were electronic after '84. The coil values from the EA82 are 0.84-1.02 prim and 8,000-12,000 sec. It says that is a hitachi though, and mine is a Diamond Electric. It kind of suggests that my coil is probably fine though.

olddog642 · Post by **olddog642** » Mon Aug 16, 2010 8:52 pm

Don't know if this is of any use to you but it is from my manual which does cover both 1600 and 1800 engines.The coil being a Diamond Electric model # E-001-02-R

Hylton:twisted:

Pootcrum · Post by **Pootcrum** » Mon Aug 16, 2010 9:10 pm

Thanks Hylton, it is useful to know.

The setup described in your manual appears to be different to my setup, mainly the ballast resistor (and hence the different coils). But still, the values you have posted aren't too dissimilar from my measured values. Maybe I need to start looking elsewhere for my power problem.

RSR 555 · Post by **RSR 555** » Mon Aug 16, 2010 10:20 pm

I'm yet to see one fail.. unless you've got it hooked up to PJ (Toonga's brumby)

Pootcrum · Post by **Pootcrum** » Mon Aug 16, 2010 10:52 pm

Alright, I am convinced to start looking elsewhere for my troubles.

That said, if anyone who reads this has a 1991 era Brumby Factory Service Manual handy, I would be very curious to know the recommended values, and it will probably help someone out in the future.

Thanks for all the quick help guys.

olddog642 · Post by **olddog642** » Mon Aug 16, 2010 11:50 pm

G'day
just some troubleshooting pointers and a wiring diagram

pride · Post by **pride** » Fri Jun 03, 2011 4:50 pm

olddog642 wrote:G'day
just some troubleshooting pointers and a wiring diagram

holy macaroni! this is what i need! thanks dude!

looks like this forum is better than google. well anyway if i encountered some difficulties doing this one i will be asking for help. so far all of the resources are in here so i just need your reference. thanks dude! god speed!

Gazza01 · Post by **Gazza01** » Tue Jan 14, 2014 9:06 am

http://jdmfsm.info/Auto/Japan/Subaru/--old%20models--

830 pages --need usb....Your ignition coil Values according to this SUBARU workshop manual. should be for a 4x4 are..PRIMARY 1.04 - 1.27. SECONDARY 7.360 - 11040.

Download the Manual on your USB its MAGIC.

Gazza01 · Post by **Gazza01** » Sun Jan 19, 2014 8:33 am

Pootcrum wrote:Hi all,

This is an offshoot of a thread I made over in the chat regarding a power issue I am trying to solve in my 91 Brumby.

I have my suspicions over my ignition coil and whether it is time for replacement. People often say that if it fires it is ok, but as I understand it, it could fire great half the time and then intermittently for some time after that if the coil is on its way out. So I have read the most definitive test is to measure the resistance of the primary and secondary windings and if they lay outside of the manufacturers recommended values, then it should be replaced.

So my coil had 1.4ohms on the primary and 11.8kohms on the secondary. Problem is I have no idea what the recommended values should be as I have no documentation. And these values change depending on the coil, but I think it is usually ~1ohm prim. and 10-11kohm sec.

For those that own one, are these values in the FSM and if so would you kindly note them here?

Failing that, if anyone has a chance, what resistance values do people measure on their coils, assuming you have the same OEM coil. It is a Diamond Electric E-019 12 V coil with no ballast resistor.

Cheers for any help!

My Subaru Brumby Manual says that Primary resistance (+ -) should be 1.40 ohms. And the Secondary resistance 11.80 ohms (either + or - to centre of coils core) Using a Multimeter. If you go on to YOUTUBE under "Testing Ignition Coil" there is a couple of good demo's on how to test your coil.

Post by **TOONGA** » Sun Jan 19, 2014 8:44 am

Gazza01 wrote:http://jdmfsm.info/Auto/Japan/Subaru/--old%20models--

830 pages --need usb....Your ignition coil Values according to this SUBARU workshop manual. should be for a 4x4 are..PRIMARY 1.04 - 1.27. SECONDARY 7.360 - 11040.

Download the Manual on your USB its MAGIC.

Gazza01 wrote:My Subaru Brumby Manual says that Primary resistance (+ -) should be 1.40 ohms. And the Secondary resistance 11.80 ohms (either + or - to centre of coils core) If you go on to YOUTUBE under "Testing Ignition Coil" there is a couple of good demo's on how to test your coil.

Gazza Those values are for the 1983 subarus with a ballast resistor.

As I stated in your other thread that isn't the Brumby / MV workshop manual it is for the 1600 -1800 series MYs.

The values for the electronic ignition coil are different (NOT BY MUCH BUT ENOUGH) to the points coil with a ballast resistor

TOONGA