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  1. #1
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    Default 1966 Triumph Chopper Wiring

    Hello all. Im trying to wire my 1966 Triumph Bonneville Chopper that Im building and somewhat confused. Im getting spark when I kick it over but not sure if I connected the wires correctly because I get spark even when I blew a few fuses and disconnected the negative battery terminal. I didnt connect the lights yet.that will confuse we as well Im sure!! Time for a 6 pack and box of Captain Crunch! Thanks, Geargeezer.

    Parts: 12V Battery, Points, Blue Streak Condenser, Single Dual Lead 12V Coil, Tympanum Unit , Ignition Switch

    Here is what I did:
    1. Positive battery terminal to red wire on Tympanum Unit with another red wire to the ignition switch terminal B.
    2. Two yellow wires on the Tympanum Unit to the Stator.
    3. Black wire on the Tympanum Unit I grounded to the frame.
    4. Negative battery terminal to fuse and grounded to frame.
    5. One end of coil to ignition switch connector IG
    6. Other end of coil to points and condenser.

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    Triumphs up thru the late 70's generally have Positive Earth (ground) to the frame. I know this backwards to almost everything else but it's how they did things.
    Last edited by CarloFreeze; 06-10-2020 at 5:29 PM.

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    Click image for larger version. 

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    Click image for larger version. 

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    Note that in the Tympanium instructions there is reference to Battery Eliminator - the unit will regulate charge without a battery or capacitor (same as MityMax units), so that is why it was still sparking when you were kicking it with the ground wire disconnected.

    Click image for larger version. 

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    ^^^this image from here:
    Thread: Triumph Wiring, Dual Coil Points
    http://www.chopcult.com/forum/showthread.php?t=37640

    With the Tympanium unit, it can be setup for either positive or negative ground.

    Sounds like you have the main system connected right...a fuse in each circuit would be a benefit, so adding one between battery and ignition switch and ignition switch and coil, and one for lights.

    1966 was first year for the 12volt system on the Triumph Bonnevilles, which is a few years ago...so are you sure the stator has not been upgraded to a higher wattage unit and that the rectifier/regulator Tympanium unit matches the alternator output?

    More info on the 1966 T120 here:
    https://www.classic-british-motorcyc...onneville.html
    Last edited by TriNortchopz; 06-10-2020 at 11:35 PM. Reason: battery eliminator

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    This is the wiring diagram I drew for my buddies bike and the same configuration I used in my bike for years. Just throw a couple fuses in there and you will be golden.

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    Thanks for all the help!! These wiring diagrams and all of your explanations are great! The bike was running years ago with the current set up so the rectifier/regulator Tympanium unit matches the alternator output, I'm good there. I think I can handle this now. If I want to keep it as a negative ground system I can right? I will add the additional fuses.
    Thanks again, I could not do it alone.
    Geargeezer

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    Yup, you can keep it as negative ground as you have it...just remember that it is!...and don't let anyone 'help' you fix a future wiring problem...they'll be telling you its positive ground....I'm positive!

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