ignition coils

mystery · 11-26-2013, 10:44 PM

So other day I had the car running put brand new ignition coils in my 85 rx7 couldnt get the oem stock ones so I used coils for. A 80s gmc truck that had the same setup and ran just fine idled and everything. Did a little more work on it today and when I tried to hop in and crank it there was no spark again... only thing I can think of is the guy before me has a direct line running from the ignition coils to the battery constantly drawing power not sure if it would make them go out like that or not since I disconnect the battery when im not out working on stuff but I was considering running it into a switch under the dash to regulate the power. Would that hookup cause the ignition coils to blow in that sence or is wiring a switch in a waste of time? Im convinced its the culprit but theres no one in this town that will help me work on it! Help!!

t_g_farrell · 11-27-2013, 07:39 AM

The power to the coil can come directly from the battery with no problems. I did that for
awhile on my coils which are Ford TFI coils (from F150s at the JY). Ideally you would want
to use a relay thats triggered by the ignition wire coming from the engine harness. The hot
side of the relay connects directly to the battery, that way your not running all those amps
through the old harness up to the ignition switch and back down.

I suspect its something else you did or hit while doing "a little more work".

mystery · 11-27-2013, 02:58 PM

Well only 2 tings I messed with was the cable for my secendary jets and I finished cutting the exhaust out so im not sure what I would have hit to cause problems of that nature :/

mystery · 12-02-2013, 10:52 PM

Came accrost a wiring diagram of the ignition coils today and found the origional harness that the coils had ran into. Fixed the problem within 10 minutes and got it firing off again. Now theres not enough fuel getting to the carberator so tomorrow im planning on changing out my fuel filters and seeing if that changes..

11-26-2013, 10:44 PM	#1
mystery Rotary Fan in Training Join Date: Dec 2012 Posts: 91 Rep Power: 13	ignition coils So other day I had the car running put brand new ignition coils in my 85 rx7 couldnt get the oem stock ones so I used coils for. A 80s gmc truck that had the same setup and ran just fine idled and everything. Did a little more work on it today and when I tried to hop in and crank it there was no spark again... only thing I can think of is the guy before me has a direct line running from the ignition coils to the battery constantly drawing power not sure if it would make them go out like that or not since I disconnect the battery when im not out working on stuff but I was considering running it into a switch under the dash to regulate the power. Would that hookup cause the ignition coils to blow in that sence or is wiring a switch in a waste of time? Im convinced its the culprit but theres no one in this town that will help me work on it! Help!!

11-27-2013, 07:39 AM	#2
t_g_farrell Waffles - hmmm good Join Date: Aug 2008 Location: Huntersville, NC Posts: 757 Rep Power: 0	The power to the coil can come directly from the battery with no problems. I did that for awhile on my coils which are Ford TFI coils (from F150s at the JY). Ideally you would want to use a relay thats triggered by the ignition wire coming from the engine harness. The hot side of the relay connects directly to the battery, that way your not running all those amps through the old harness up to the ignition switch and back down. I suspect its something else you did or hit while doing "a little more work". __________________ 1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00

11-27-2013, 02:58 PM	#3
mystery Rotary Fan in Training Join Date: Dec 2012 Posts: 91 Rep Power: 13	Well only 2 tings I messed with was the cable for my secendary jets and I finished cutting the exhaust out so im not sure what I would have hit to cause problems of that nature :/

12-02-2013, 10:52 PM	#4
mystery Rotary Fan in Training Join Date: Dec 2012 Posts: 91 Rep Power: 13	Came accrost a wiring diagram of the ignition coils today and found the origional harness that the coils had ran into. Fixed the problem within 10 minutes and got it firing off again. Now theres not enough fuel getting to the carberator so tomorrow im planning on changing out my fuel filters and seeing if that changes..