Finally completely fried the ol' Thunderheart

Energy One

Th3InfamousI

Administrator
Staff member
Now that could be: the highway lights are suspect. Passes through a simple toggle on the upper fork nacelle.
I have the new Thunderheart but I imagine the circuitry is roughly similiar with their older models. I had an LED that was shorting out which tripped the relay and wouldnt allow bike to turn on. Another guy on here had a tach ring shorting out that did the same.

Just an idea to go one by one unplugging lights to see if you can narrow it down maybe.

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TapioK

Well-Known Member
I tend to remember a thread where extra riding lights fucked up the whole bike electronics? EHC didn't like the extra load or something.


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Th3InfamousI

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Staff member
I tend to remember a thread where extra riding lights fucked up the whole bike electronics? EHC didn't like the extra load or something.


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He has the older model tapio I think its more forgiving.

Also regarding my earlier post when I said LED I meant the headlight. LED headlight had shorted out.

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BigDogRick

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He has the older model tapio I think its more forgiving.

Also regarding my earlier post when I said LED I meant the headlight. LED headlight had shorted out.

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Yep. That is correct. The Thunderheart has a relay for them along with a center tail light.
 

FrankBDPS

Well-Known Member
Rick, I don't want to confuse things any more than they have to be. When I rebuilt my bike and had the wiring connectors apart not all of the wire colors matched exactly from the harness to the diagrams that Thunderheart has posted on the web. It's just some thing you need to look out for. You are on the right track. That ehc is just a bunch of relays. Dont over think it. Don't forget the ignition switch. I would put a jumper across it while trouble shooting the system. Good luck!
 

BigDogRick

Well-Known Member
Rick, I don't want to confuse things any more than they have to be. When I rebuilt my bike and had the wiring connectors apart not all of the wire colors matched exactly from the harness to the diagrams that Thunderheart has posted on the web. It's just some thing you need to look out for. You are on the right track. That ehc is just a bunch of relays. Dont over think it. Don't forget the ignition switch. I would put a jumper across it while trouble shooting the system. Good luck!
Thunderheart said the same thing. We believe the switch is good. What is really strange is we have not found anything that burnt up yet. I am leaning to the Voltage Regulator or the Transmission Sensor. We both hd to lay off yesterday. Will renew the search today.
 

BigDogRick

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Ok gurus, took a bad turn. Confirmed voltage through ehc to switch and out the other side. No apparent short in headlight nacelle or highway lights. No visible damage to transmission sensor wire or evidence of melting (still looking for whatever burned up). Here's the bad: we lost response to start button. Cannot turn starter like we could when we finished. Battery still cranking voltage.


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BigDogRick

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Ok gurus, took a bad turn. Confirmed voltage through ehc to switch and out the other side. No apparent short in headlight nacelle or highway lights. No visible damage to transmission sensor wire or evidence of melting (still looking for whatever burned up). Here's the bad: we lost response to start button. Cannot turn starter like we could when we finished. Battery still cranking voltage.


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Also disconnected voltage regulator feed to battery. So no grounding short there.


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BigDogRick

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Also disconnected voltage regulator feed to battery. So no grounding short there.


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When we could get starter response, she wanted to fire but would not. Unfortunately, we have lost that now. Anyway, just seemed like the coil was trying - thinking it is ok.


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Th3InfamousI

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Staff member
When we could get starter response, she wanted to fire but would not. Unfortunately, we have lost that now. Anyway, just seemed like the coil was trying - thinking it is ok.


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You sure you didn't unplug the green starter trigger wire while you were messing with the transmission speed sensor?

Stupid..i know but it's usually the little things.



And did you confirm power to the ignition Cam sensor in the nose cone?


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BigDogRick

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When we could get starter response, she wanted to fire but would not. Unfortunately, we have lost that now. Anyway, just seemed like the coil was trying - thinking it is ok.


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Got the starter response back. The second cluster was loose at the ehc. False alarm.


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BigDogRick

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Got the starter response back. The second cluster was loose at the ehc. False alarm.


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She wants to fire without the voltage regulator connected but just doesn't seem to have enough voltage putting out of the coil to fire.


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BigDogRick

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She wants to fire without the voltage regulator connected but just doesn't seem to have enough voltage putting out of the coil to fire.


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Eric. Yeah, we caught the green trigger wire. We just got stumped.


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Th3InfamousI

Administrator
Staff member
She wants to fire without the voltage regulator connected but just doesn't seem to have enough voltage putting out of the coil to fire.


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If you got a spark plug tester id make sure your truly getting spark on both cylinders. It won't start with only one side firing. Or ground plug to fins

Unless you changed coils when you installed that ignition Cam sensor that should be a dual fire coil so you should have spark on both sides always.




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BigDogRick

Well-Known Member
If you got a spark plug tester id make sure your truly getting spark on both cylinders. It won't start with only one side firing. Or ground plug to fins

Unless you changed coils when you installed that ignition Cam sensor that should be a dual fire coil so you should have spark on both sides always.




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It's a three pole coil we believe is single fire.
 

Th3InfamousI

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It's a three pole coil we believe is single fire.
Ah gotcha..so upgraded with that ignition. Either way I would Check the spark manually just to be sure it's really firing on both sides.



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BigDogRick

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Thunder heart advised single fire also.


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As all of this is happening, the ehc does not sweep the speedometer, no lights come on, and there is no evidence of life there. What we are nearly successful at is firing the ignition module in spite of the ehc.


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Th3InfamousI

Administrator
Staff member
As all of this is happening, the ehc does not sweep the speedometer, no lights come on, and there is no evidence of life there. What we are nearly successful at is firing the ignition module in spite of the ehc.


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Was just gonna ask if lights worked..


Does the ignition in the nose cone get it's power from the EHC or wired seperatly?

If your Cam sensor gets power from EHC I would unplug it and see if you get your lights back. Then at least a bad Cam sensor is ruled out as a shorting out issue.

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Last edited:

BigDogRick

Well-Known Member
Was just gonna ask if lights worked..


Does the ignition in the nose cone get it's power from the EHC or wired seperatly?

If your Cam sensor gets power from EHC I would unplug it and see if you get your lights back. Then at least a bad Cam sensor is ruled out as a shorting out issue.

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I failed to mention early on, this has the second Thunderheart ignition module that Shannon mentioned earlier forward of the module itself. It resembles the racing ignition module you see on Thunderheart's webpage that is for dual fire. This is what was bypassed by the Crane. So the ehc control module itself merely relays circuits to components.
The Crane is now independent of the ehc.


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