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PostPosted: Sun Aug 25, 2019 7:55 am 
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To the on ramp

Joined: Fri Jun 19, 2015 5:14 am
Posts: 289
Country: USA
Bikes owned: T500
I have a 1966 Suzuki S32-2 olympian that I am rebuilding into a resto-mod type build

Nearly everything I touch on this bike is broken or needs repair. I completely rebuilt the engine using all new transmission gears because they were all shot.

Anyway- I am having trouble with the starter/ magneto unit. The starter doesn't seem to work. I was planning on eliminating the electric start anyway. I will basically disconnect the two large gauge wires that go from starter solenoid to starter unit and the other wire that goes from battery to starter unit. I also wanted to replace the old, antiquated regulator/ rectifier with a newer unit. This is where my question comes into play. Has anyone done this? The modern R/R assemblies come in the 2 and 3 wire varieties. Which will work with the S32? See attached wiring diagram. The wires in question are Red/Green, Green and Yellow as they exit the stator assembly and enter the regulator assembly at the "D", "F", and "B" terminals respectively.

Thanks.


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PostPosted: Sun Aug 25, 2019 7:56 am 
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To the on ramp

Joined: Fri Jun 19, 2015 5:14 am
Posts: 289
Country: USA
Bikes owned: T500
and here is a pic of how the bike currently looks.
The engine is down in the basement after the rebuild.
The wheel hubs were vapor blasted and new spokes are installed.
All the bodywork is going off to powdercoating.


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PostPosted: Sun Aug 25, 2019 6:10 pm 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
Posts: 3477
Location: southwestern Pennsylvania
Country: USA
Bikes owned: 69 T350 thru 75 GT750
The S32 doesn’t have an alternator. It has a generator with a field coil that outputs DC.
Its like an old school car from the 1950s, but to make things more complicated the generator & starter are combined into a single device.

The S32 regulator has to deal with the dual nature of the generator/starter. That may limit the possible aftermarket choices.
But if you eliminate the starter, there should be some good aftermarket regulators that are suitable.

_________________
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 project & 75
GT380 72
T500 73 project
T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE


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PostPosted: Tue Aug 27, 2019 2:21 pm 
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Expert racer

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 1035
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
sbaugz wrote:
Nearly everything I touch on this bike is broken or needs repair.

That is the problem with restoration on really old bikes. It seems almost never-ending when, for each step you take forward fate seems to take you two steps backwards!
Your electrical woes remind me of an old Dolphin 2-stroke marine engine I worked on years ago. It too had a combined starter/magneto but had the added complication of running in either direction. To put the boat in reverse you had to stop the engine and restart it backwards. Not an easy system to get your head around how the wiring works.
You have the makings of a nice bike though and it sounds like you are doing a thorough job on it, so I am sure it will be great when it is done. Good luck.


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PostPosted: Tue Aug 27, 2019 2:49 pm 
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Joined: Wed Jul 10, 2013 12:04 pm
Posts: 1035
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
You might want to check out your starter switch relay is functioning correctly.
Check:
1. That you have + battery voltage at the red wire.
2. That the black wire shows + battery voltage when you press the starter button. (If not, check the yellow and green wire is switching thus providing the signal to the relay to actuate).
4. The black wire has continuity to your starter/dynamo.
5. That the wires are connected to the right terminals.
6. That your casing has a good earth (check continuity between casing and battery -ve).

Let us know what your findings are. It might be handy to see the whole wiring diagram to help with further diagnosis.


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PostPosted: Thu Aug 29, 2019 6:20 am 
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To the on ramp

Joined: Fri Jun 19, 2015 5:14 am
Posts: 289
Country: USA
Bikes owned: T500
sportston wrote:
You might want to check out your starter switch relay is functioning correctly.
Check:
1. That you have + battery voltage at the red wire.
2. That the black wire shows + battery voltage when you press the starter button. (If not, check the yellow and green wire is switching thus providing the signal to the relay to actuate).
4. The black wire has continuity to your starter/dynamo.
5. That the wires are connected to the right terminals.
6. That your casing has a good earth (check continuity between casing and battery -ve).

Let us know what your findings are. It might be handy to see the whole wiring diagram to help with further diagnosis.


thanks. useful advice that I have been waiting for.


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PostPosted: Thu Aug 29, 2019 10:08 am 
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Expert racer

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 1035
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
You're welcome. :up:


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