Tscu rebuilding

[sedelen]

And another quandry?? As i have read different threads about the failures, i have noticed a disproportionate amount seem to be the right side stops...wonder why this is so? If they made the left circuitry so well, then what explains why the right side sux so bad???

Mine messes up on the left (occaisionally) other than that it's fully functional.

[Matchless]

Chuck,

Here is the schematic for the "newer" self cancelling setup:

[Matchless]

Here is the schematic for the "older" unit:

[rustybronco]

Andre, on the B/Bl flasher inhibit wire, does it use earth or B+ to cancel flasher relay?

[Matchless]

Andre, on the B/Bl flasher inhibit wire, does it use earth or B+ to cancel flasher relay?

Dale,
A B+ is sent to the flasher relay to keep it operated on the holding coil.

[rustybronco]

Thanks Andre! it was the only thing I couldn't garner without the bike in front of me.

[chuck hahn]

Dale...soon as you get it all figured out let me know...I will pay you to build me a better one..LOL

[Matchless]

Dale,
I noticed that the later model schematic has very poor wire colours and I will try and redraw it with clearer colours and replace it.

Chuck,
The newer TSCU is unfortunately married to the later handlebar direction switch. You will have to replace them as a pair if you want to upgrade

I have a schematic drawn up for the newer type, but it has some component values missing and has not been cross checked yet.

[rustybronco]

Dale,
I noticed that the later model schematic has very poor wire colours and I will try and redraw it with clearer colours and replace it.

Andre, it's not necessary for you to do that on my account. I already traced the copies I brought to work during my lunch hour.

now I'm looking up a suitable relay with momentary latch and unlatch coils. I had one looked up some time ago, but somehow I lost the bookmark.

[Matchless]

Andre, it's not necessary for you to do that on my account. I already traced the copies I brought to work during my lunch hour.

now I'm looking up a suitable relay with momentary latch and unlatch coils. I had one looked up some time ago, but somehow I lost the bookmark.

Dale, updated the schematic, just in case someone else also wanted to use it.

I looked for latching relays a while back and they were very expensive out our way and very little to choose from.

I have also used a SCR to latch a relay, but needed to manually interupt the circuit with another relay or switch to release it. The old VW Beetles had a headlight relay that flip-flopped for high and low.

[rustybronco]

I have also used a SCR to latch a relay, but needed to manually interupt the circuit with another relay or switch to release it. The old VW Beetles had a headlight relay that flip-flopped for high and low.

Andre, in digging around I saw where someone used a 1970 beetle headlamp relay as well.

no big issue as we can always use regular relays to do the same thing. you just need to use more of them, and more equals space.

[sedelen]

Dale,
I noticed that the later model schematic has very poor wire colours and I will try and redraw it with clearer colours and replace it.

Chuck,
The newer TSCU is unfortunately married to the later handlebar direction switch. You will have to replace them as a pair if you want to upgrade

I have a schematic drawn up for the newer type, but it has some component values missing and has not been cross checked yet.

I thought about that possibly being the case.

[bakalorz]

Dale,

Chuck,
The newer TSCU is unfortunately married to the later handlebar direction switch. You will have to replace them as a pair if you want to upgrade

I have a schematic drawn up for the newer type, but it has some component values missing and has not been cross checked yet.

I am eventually planning to basically make my own TSCU with a PIC microproccessor, and seeing this thread has got me re-motivated ...

The big holdup for me is that I need to get one of the proper left handlebar switches.

I currently can turn my headlight off and would really not like to lose that functionality.

So my question is what GS years and models have a left hand switch that works with a TSCU and also has a headlight on/off switch. (not just hi/low beam, but actual on/off too)
(and, since it apparently matters, which TSCU do they use, the old or the new style)

After that, I guess its time to haunt E-bay ...

After I design and build it, I will release info on it if anyone else wants to build their own.
(If there would be enough demand, I'd make em to sell for $50 or $60 too)

P.S. ... I will guess that if your bike didn't come with a TSCU there is no reed switch ... what do you think of the idea of linking to the brake light instead ... so if the signal normally cancels after say 5 seconds, it won't start timing that five seconds until the brakes are released ...

[Matchless]

Martin, my 1980 has the light switch on the right handlebar controls as they were standard for our country at the time.
How about one TSCU that will replace either type?

[rustybronco]

Martin, Martin (wallowgreen) has already built one of the first generation TSCU's. it might pay to PM him any questions/thoughts/issues you might have before you start back into designing your own.

for second part of your question, as far as I know the 78-79 GS1000E's, the 79 GS850G's and the 79 L models used the same switch.

and lastly, personally I wouldn't use the release of the brake light for the start point of a count down timer. at a stop, when some is approaching from behind, I like to modulate the brake light.