gstallons Posted September 25, 2017 Share Posted September 25, 2017 Can you get a wiring diagram and look to see what might be the matter ? And are you installing the correct coil ? Check the resistance in the primary of the good coil against the replacement coils to see if they are the same . Link to comment Share on other sites More sharing options...
gstallons Posted September 25, 2017 Share Posted September 25, 2017 when I say the same , I mean the same . 1.5 , 2.0 or 3.5 sounds similar but are VERY different . Link to comment Share on other sites More sharing options...
luhbo Posted September 26, 2017 Share Posted September 26, 2017 "All about BERU coils" http://beru.federalmogul.com/sites/default/files/ti_07_ignition_coils_gb_2013_lowres.pdf Including self-test (for the reader) Twin-Plugged specs: BAE 800 AK Primary resistance is 30% less, secondary 100% more (0.5 vs. 0.8 Ohm; 7,5 vs. 3,3 kOhm) Link to comment Share on other sites More sharing options...
Kiwi_Roy Posted September 26, 2017 Share Posted September 26, 2017 The coil shouldn't be grounded long enough to overheat. When the bike is running you have +12 on one end of the coils The ECU briefly grounds the other end. Something is wrong with the ECU or you have a ground fault. Link to comment Share on other sites More sharing options...
luhbo Posted September 26, 2017 Share Posted September 26, 2017 If it (Chuck's post) were oil filled aluminium can type coils as usually used with points then they didn't overheat. I had two of them fail because of broken secondary wires. Link to comment Share on other sites More sharing options...
Chuck Posted September 26, 2017 Share Posted September 26, 2017 If it (Chuck's post) were oil filled aluminium can type coils as usually used with points then they didn't overheat. I had two of them fail because of broken secondary wires. They were overheating. I came out of the motel in the morning on coil number two and there was coil oil underneath the bike. Link to comment Share on other sites More sharing options...
Kiwi_Roy Posted September 26, 2017 Share Posted September 26, 2017 That's hard to understand, with the key Off relay 5 should be open so nothing on the coils Even if the key was left on Relay 5 should be open Something is wrong in the wiring for sure. Link to comment Share on other sites More sharing options...
swooshdave Posted September 26, 2017 Share Posted September 26, 2017 I'd love to see someone sketch up a wiring diagram for just the coils. Link to comment Share on other sites More sharing options...
docc Posted September 26, 2017 Share Posted September 26, 2017 I think Chuck's over heated coil was on an SP1000, so no Relay 5 like a V11. Link to comment Share on other sites More sharing options...
Chuck Posted September 26, 2017 Share Posted September 26, 2017 I think Chuck's over heated coil was on an SP1000, so no Relay 5 like a V11. Yes.. I just thought it *might* be germane to the discussion. For what ever reason, we have a points ignition and computer ignition doing the same thing. Running a wire directly from that set of points to the coil cured it. I *assumed* there was something going on in the harness, but have no clue what it was. Link to comment Share on other sites More sharing options...
Lucky Phil Posted September 27, 2017 Share Posted September 27, 2017 I think Chuck's over heated coil was on an SP1000, so no Relay 5 like a V11. Yes.. I just thought it *might* be germane to the discussion. For what ever reason, we have a points ignition and computer ignition doing the same thing. Running a wire directly from that set of points to the coil cured it. I *assumed* there was something going on in the harness, but have no clue what it was.I remember Chuck Ducati coils used to melt into a sticky puddle if the ignition switch was left on without the engine running due to the coils being continuously powered. Could you have had an ignition switch contact not releasing or relay not relaxing causing the same thing? Ciao Link to comment Share on other sites More sharing options...
luhbo Posted September 27, 2017 Share Posted September 27, 2017 Can you remember the specs of these Ducati coils? Standard >3Ohm coils? Ducati Scrambler 6V maybe? Link to comment Share on other sites More sharing options...
Lucky Phil Posted September 27, 2017 Share Posted September 27, 2017 Can you remember the specs of these Ducati coils? Standard >3Ohm coils? Ducati Scrambler 6V maybe?Sorry can't recall. They were 12volt used on the 1980s bikes like Milles, and my Factory TT2 race bike. White in colour they were. Ciao Link to comment Share on other sites More sharing options...
Chuck Posted September 27, 2017 Share Posted September 27, 2017 I think Chuck's over heated coil was on an SP1000, so no Relay 5 like a V11.Yes.. I just thought it *might* be germane to the discussion. For what ever reason, we have a points ignition and computer ignition doing the same thing. Running a wire directly from that set of points to the coil cured it. I *assumed* there was something going on in the harness, but have no clue what it was.I remember Chuck Ducati coils used to melt into a sticky puddle if the ignition switch was left on without the engine running due to the coils being continuously powered. Could you have had an ignition switch contact not releasing or relay not relaxing causing the same thing? Ciao Like I said, I'm clueless. It was only the right coil, though. It only happened when it was running, to boot. That was a memorable trip to California.. Link to comment Share on other sites More sharing options...
luhbo Posted September 27, 2017 Share Posted September 27, 2017 ... and my Factory TT2 race bike. White in colour they were. Ciao The Factory TT2 race bike might not have had points in the 80ies. Link to comment Share on other sites More sharing options...
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