Evo shuts down after 20 miles
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Intermediate
Joined: Jul 2012
Posts: 49
Likes: 0
From: CALIFORNIA
alright guys so i took a stock hd dual fire coil off my buddies bike (its good his bike runs) slapped it on my bike but no spark still. the module wiring is good, if i hook the module power wire direct to the battery it lights up but when connected to hot wire from ignition id does not light up. so i rechecked wiring from ignition and battery voltage, battery voltage is 13.6 but hot wire from ignition (white wire) it only shows 11.2 so somewhere there is a voltage drop. i tried to trace wire back to ignition by pulling the dash and speedo off but could not find it, seems its under the tank to the main harness the only way to really get to it is to pull off the left side tank. it might help if anyone has a wiring diagram. judging by my buddies bike which has the same dash and speedo my wiring is a 1994. I tried to find the wiring diagram on the internet but iam unable to find one, if anyone has one please let me know. thats where im at right now so any help is appreciated.
Thread Starter
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Intermediate
Joined: Jul 2012
Posts: 49
Likes: 0
From: CALIFORNIA
thanks tee vee, i prob dont need the fsm im just trying to trace the white wire that goes to coil cause im having a voltage drop. funny thing is that when i test the wire for voltage it reads 11.8 when ign on and wire not connected to coil but it reads 4.2 when ign on and connected to coil i thought it should read the same as the battery voltage which is 13.8. should i have the same voltage at coil as the battery??? can i just run a wire from ign switch to the coil for power??? any thoughts or ideas i appreciate.
Thread Starter
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Intermediate
Joined: Jul 2012
Posts: 49
Likes: 0
From: CALIFORNIA
doc i ran a lead direct from the battery to the coil a couple weeks ago and got some real big backfire through the exhaust, maybe timing was off but kinda scared me to run direct. should i have 12+volts at coil? should i run a wire from ign switch to coil +?
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Joe Kucinski
Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
Check the voltage at the ignition switch as the contacts can corrode and create high resistance which would drop your voltage to the coil. As Dr. Hess says, if you jumper the coil from the battery and it runs that eliminates the coil and the pickup and ignition. Then you just need to start tracing voltage from the coil to the battery. That would include the stop/run switch on the right grip.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
If the bike is backfiring through the exhaust, the timing is late, the fact that it ran right then started acting up sounds like the timing could have moved. Re-set the timing making sure you are usuing the correct timing mark. You have no idea how many customers bring bikes in with modules they've installed and the bike won't start. Next try to start it, if it doesn't start then run a fused jumper to the center post wit the white wire removed. If there is a short in the white wire it can pull the voltage down. An electronic ignition system typically needs to "see" a little over 9.5 volts to function.
Now could the new module be bad, certainly, electronics typically last a long time or die shortly after being put into use. Electrical and ignition problems can be difficult enough to diagnose hands on in person, let alone second hand over the internet. No offense to anybody, but over the years here many a poster said "yes I did that right", when in fact it wasn't done right. So in closing stay calm, we will work this out!!! Hope this helps.
John
Now could the new module be bad, certainly, electronics typically last a long time or die shortly after being put into use. Electrical and ignition problems can be difficult enough to diagnose hands on in person, let alone second hand over the internet. No offense to anybody, but over the years here many a poster said "yes I did that right", when in fact it wasn't done right. So in closing stay calm, we will work this out!!! Hope this helps.
John
Last edited by miacycles; Aug 2, 2013 at 08:13 AM. Reason: typo