Thunderheart ignition 04 Chopper

[ParkerBigDog04]

Bike started misfiring at lower acceleration, so I pulled seat off to check tightness of connections. All seemed tight but the bike would not run. Red light no more on TH billet aluminum module under seat. Multiple light module has 3 of 5 lights solid green. I hooked a volt meter to negative battery terminal and touched different power cables all registered including....... The thunderheart previously lite up module. The volts was almost 12 to me having an open metal anything under a seat with a positive charge doesn't seem right. So has this thunderheart module shorted? The re light is not on during crank or ever now like it used to be.

 

[ParkerBigDog04]

I have confirmed the module is getting positive energy but so is the housing!!!

 

[BadDawg Bill]

Do yourself a favor and buy an Ultima ign. system and forget about problems...

Ultima® Single Fire Programmable Ignition Module for '83 Up Big Dog Titan | eBay

 

[Sven]

I have confirmed the module is getting positive energy but so is the housing!!!

Are you saying, I could take a wire, ground it to the frame, place that wire to the body of the bulb, then take a 2nd wire from the bulb, touch the wire to the 'housing' and the bulb lights, correct?

I want to make sure this is happening and no fuse is blown, nor the battery is not discharged, and all things come to mind, but I'd like to see that bulb light off on the housing.

 

[ParkerBigDog04]

Are you saying, I could take a wire, ground it to the frame, place that wire to the body of the bulb, then take a 2nd wire from the bulb, touch the wire to the 'housing' and the bulb lights, correct?

I want to make sure this is happening and no fuse is blown, nor the battery is not discharged, and all things come to mind, but I'd like to see that bulb light off on the housing.

What I meant is I turn the ignition on with the key, touch a ground/battery with negative pointer then take positive pointer to billet housing of the thunderheart ignition module that has a light on it (not light though) and anywhere I touch the housing my volt meter goes to 12.
An open positive connection seems too odd to be right but I am not at all familiar with this system as I just got this bike.
The bolt screws that fasten it to the fender also have positive readings.

 

[Sven]

Ready?

1. Key on:
a. I take my ohm meter, set it to 20v.
b. I take my neg -probe, ground it or touch it to battery neg -post.
c. I take my posi +probe, ground the thunder box I see 12v.

2. Key off:
a. My probes are still touching ground and box.
b. My key is off.
c. Do I have 12v still at the thunderbox?

3. Main Wire Harness:
a. I want my hot+ wire removed from the box.
b. I am going to turn the key on, and is the box hot with main only removed?
c. I have 12v, key on, no +wire into the thunderbox, I still have 12v.

Conclusion:

I have a direct short still at a hot side of the other wires still connected.

4. Wire pull one at a time:
a. I have a hot box and now I want the ground wire off it, or is the thunderbox the ground?
b. I want to pull every wire off the t-box. I should see no 12v to the box.
c. I begin to jumper wire the main harness connector ends to the one wire male to female connector at the t-box: I want to see the jumper wire spark/arc = Bingo! Found single Shorted wire (usually 1 wire).

 

[Brew]

Cam sensor gave up the ghost?

 

[Diesel Dan]

Cam sensor gave up the ghost?

Excatly what I was thinking......Cam sensor works with the Ignition module to FIRE the coil...........pull the points cover off your motor,and see if it has a nasty burnt up smell,or if it is melted...........if so...Defective cam sensor.........Also do what Sven suggested with your Multi-Meter.

 

[IRONHEAD]

Oh Lord... I think I'm finally getting the hang of Sven. Is there any medication I should be taking?

 

[ParkerBigDog04]

Excatly what I was thinking......Cam sensor works with the Ignition module to FIRE the coil...........pull the points cover off your motor,and see if it has a nasty burnt up smell,or if it is melted...........if so...Defective cam sensor.........Also do what Sven suggested with your Multi-Meter.

This post has my attention so I will try that.
The THC seemed to have some intermittent red lights before it quit. Question does that THC light always stay on blink in its normal function?

 

[ParkerBigDog04]

Do yourself a favor and buy an Ultima ign. system and forget about problems...

Ultima® Single Fire Programmable Ignition Module for '83 Up Big Dog Titan | eBay

Does this new unit you recommend have a tach wire so the big dog tach works?
Also on the THC unit there appears to a three wire or more going directly to the six speed Baker what effect will this have if I get the Ultima

 

[BadDawg Bill]

I don't have an Ultima but you can look at the link I gave you or Google it and get that info. I have a Crane which has the tach wire. Another board I'm on the gys swear by the Ultima and it's $100 less than the Crane.

 

[Raywood]

Does this new unit you recommend have a tach wire so the big dog tach works?
Also on the THC unit there appears to a three wire or more going directly to the six speed Baker what effect will this have if I get the Ultima

Why would the ignition have any wires going to the tranny. Only wire off the tranny goes to the speedo for your speed indication other than the neutral switch.

 

[Raywood]

Its been a long time since I had my 03 Mastiff. Do you still have the dual fire ignition or has it been changed to a single fire? If it's stock it will be dual fire and only two wires going to the coil. Other wires go to the EHC for power and tach

 

[ParkerBigDog04]

Why would the ignition have any wires going to the tranny. Only wire off the tranny goes to the speedo for your speed indication other than the neutral switch.

I really don't know why but I have traced this wire from the THC under the seat two the back of the tranny. It's one of two plugs with 3-5 wires coming out

 

[Raywood]

I really don't know why but I have traced this wire from the THC under the seat two the back of the tranny. It's one of two plugs with 3-5 wires coming out

It keeps on going along the frame rails to the ignition module in the cam chest and probably the other two to the coil.

 

[Raywood]

Parker, all the wiring schematics for most of the years of our bikes are in the Tech section to help you understand the wiring. Copies of manuals are in there also

 

[BadDawg Bill]

You would have a hot (trigger wire) to the coil, a tach wire from the ign system and your neutral wire from the tranny.

 

[Diesel Dan]

This post has my attention so I will try that.
The THC seemed to have some intermittent red lights before it quit. Question does that THC light always stay on blink in its normal function?

YES Parker...........heres the deal..........On your bike with the Thunderheart Ignition module, WHILE CRANKING the engine over the red LED on the module should pulse, then once engine fires up the red LED should stay on constantly:up:.......if not,probally lost your cam sensor..........pretty common on 2004 and older bikes........lol:lol:.......I keep like 3 or 4 on hand all the time.......give that a shot and see what you find..........

 

[Sven]

Smell & Touch: Ready?

1. I want to smell that little black box in the cone cover.
a. That is copper wire cooking the crank sensor.
b. Go to the cam sensor, smell the same bake that protects the copper windings too.
c. There should be a possible growth or expansion and a crack at that black bake?

2. I want a screwdriver in hand with a plastic handle, not bare tool in hand.
a. With key on, I want to trigger the black bake's magnetic tip coming out of it.
b. So my screwdriver tip is grounding on and off at that tip I make and break contact.
c. I have my spark plugs in my plug wires and grounded at the heads. I am watching spark to both plugs.

3. Here is the conclusion;
a. I have a working thunderspark unit.
b. When I roll my eyes around I look inside that cone and watch that ignition spin I am doing the same thing as if the crank spun around and made spark you turn the key on and hit the starter, correct?
c. WATThe fuck is the difference I tap the cam or crank sensor and act the spin. WATThefuck am I missing withat move??!!!

Signed,

I am not done yet.

4. Whereas, we still have an an alleged hot box body @ 12v?
a. Would a cam sensor wire short to ground but act the resistor all the way to the box and I pull the cam sensor connectors, check the thunderbox body for 12v?
b. What if I pull the crank sensor connector off, I +prong my watthefuck- I still see 12v still?
c. WATT are the odds?

Where is blue bagger Mike? He's Thundersavvy with the ferrite deal. Where is the ferrite trick I have spark clickitea click On-OFF-ON-OFF says the 1's and 0s.