multiple ignition module failures
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Cruiser
Joined: Jan 2014
Posts: 147
Likes: 61
From: Mulkeytown, IL
multiple ignition module failures
Hi all,
I am now on my third OEM ignition module on my 1993 FXSTS in three months! Mine doesn't get hot and then re-start after it cools. It just shuts off and never starts again! The first failure was the original module, then a new OEM module and finally a used one off of Ebay.
I have run every check in the FSM twice and checked the charging system to make sure it is not over-charging. I have an extra ground strap from the battery to the engine. I have checked every inch of the wiring harnesses and tested every wire and all grounds. I replaced the pickup module last year as its' potting was melting, but it was still running fine.
What normally causes a module to fail? It could help lead further diagnosis.
The only thing I haven't checked is charging system output amperage. I have not actually done voltage drop tests on the system. My ignition switch has had contact problems as of late, so I have a new one on the way.
I am about to go to an aftermarket system, but whatever my problem is might smoke a new system too!
Any ideas area appreciated.
I am now on my third OEM ignition module on my 1993 FXSTS in three months! Mine doesn't get hot and then re-start after it cools. It just shuts off and never starts again! The first failure was the original module, then a new OEM module and finally a used one off of Ebay.
I have run every check in the FSM twice and checked the charging system to make sure it is not over-charging. I have an extra ground strap from the battery to the engine. I have checked every inch of the wiring harnesses and tested every wire and all grounds. I replaced the pickup module last year as its' potting was melting, but it was still running fine.
What normally causes a module to fail? It could help lead further diagnosis.
The only thing I haven't checked is charging system output amperage. I have not actually done voltage drop tests on the system. My ignition switch has had contact problems as of late, so I have a new one on the way.
I am about to go to an aftermarket system, but whatever my problem is might smoke a new system too!
Any ideas area appreciated.
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
some original systems work fine for life it seems and piles have been a Pinta
the trigger in the cone has also caused the module to fry
ultima ignition mod is the one I turn to - the coil they sell with it is junk use your OEM one or buy a dyna single fire and go that way
its like an oil thing who make the best but I have installed 100 if we put one in and keep them in stock
the trigger in the cone has also caused the module to fry
ultima ignition mod is the one I turn to - the coil they sell with it is junk use your OEM one or buy a dyna single fire and go that way
its like an oil thing who make the best but I have installed 100 if we put one in and keep them in stock
Grand HDF Member
Joined: Apr 2007
Posts: 3,723
Likes: 3,063
From: Brighton, MI
5.0 ohm coil or 3.0 ohm? Pretty sure my 94 calls for 3.0 ohms? Is there is a reason for the 5.0 coil and I'm missing something? YD
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,560
From: Haslet Texas
The single fire is 1.5 ohm and for some reason I got the two mixed up in my head.
I blame it on Monday!!!!
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Grand HDF Member
Joined: Apr 2007
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From: Brighton, MI
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Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,560
From: Haslet Texas
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
wrong again - 1 and 1/2 ohm coil is a 6 volt antique for the most part
3.0 ohm coils come mostly 12 volt BUT are available in 6 volt as well you need to know what your doing when ordering
5.0 coil is a point ignition coil
now variables also exists like 1.8 2.1 3.0 6 volt - then 12 volt 1.5 - 2.8 and also point ignition 4,8 and 5.2 it depends who is making it and for what
and I am sure other OHM numbers are around I did not list
to make it simple - evo 3.0 ohm or around that is fine the lower the OHM the hotter the coil is
3.0 ohm coils come mostly 12 volt BUT are available in 6 volt as well you need to know what your doing when ordering
5.0 coil is a point ignition coil
now variables also exists like 1.8 2.1 3.0 6 volt - then 12 volt 1.5 - 2.8 and also point ignition 4,8 and 5.2 it depends who is making it and for what
and I am sure other OHM numbers are around I did not list
to make it simple - evo 3.0 ohm or around that is fine the lower the OHM the hotter the coil is