Suzuki TS 100 Battery Hook up

[iridium]

I've got a 1978 Suzuki TS 100 that I've been running without a battery for some time.
I'd like to put turn signals on it and also have the neutral indicator light work, so I picked up a battery.

I'm not good with wiring diagrams, but it looks like the negative goes to the chassis, but I'm not sure where the positive should go.

There doesn't seem to be an obvious wire by the battery box - which is on the right side of the frame. There is what appears to be a red wire under the seat.

Any help would be greatly appreciated.

[jaffa90]

Is it wired for turn signals?

https://www.google.co.uk/search?q=1978+suzuki+ts+100+wiring+diagram&tbm=isch&source=iu&ictx=1&fir=A7gg2QFq5FPHWM%253A%252C_wxjxGMwf7mBQM%252C_&vet=1&usg=AI4_-kSH8s8RSsUl49YWQVi51xHGqgzbew&sa=X&ved=2ahUKEwjFrNOY5Z3pAhXSZxUIHSYRANYQ9QEwAHoECAkQFg

Third pic in?

A red wire from the battery should have an inline fuse to the ignition switch.

[iridium]

Yes, it is wired for turn signals.

I have looked at the wiring diagram a lot, and I just don't understand the connection of the battery positive. It looks like it gets connected to the rectifier?

[jaffa90]

Find the rectifier and output wires,

[iridium]

So here's a pic of the rectifier on my bike. Do I need to tap into the + terminal with the + on the battery?

[-]

Where is the fuse box? It should be as near to the battery positive terminal as possible, by design, so less wire is unprotected.
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[stinkwheel]

If the red wire under the seat is connected to the ignition switch at the other end and has nothing attached at that end, that's the one you want.

In fairness, all red wires on that bike SHOULD be connected to the battery positive somewhere along their length but you shouldn't need to "tap into" one. That's assuming it hasn't been messed about with. The black tape on the rectifier makes me a tad worried it may have been.

As above, there should be an inline fuse in the wire coming off the battery positive.

So if unmessed with and you have an unattached red wire under the seat, fit a (?15A) inline fuse holder and fuse to the end of that wire, then attach the other side of the fuse holder to the battery positive. I would use an automotive blade fuse holder because they are easy to buy fuses for in any filling station.

It does not have a fuse box so don't worry about looking for one.
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[A100man]

These old bikes tend to have an in-lne fuse holder on the battery positive, Maybe you can find the remnants of one somewhere..
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[stinkwheel]

[iridium]

Thanks to everyone for your help. I believe this description fits my situation the best. I'm going to trace the red wire under the seat. Hopefully that's the one. I've picked up a 15A fuse as well.

Once it's connected, should i see a brighter headlight or will it still vary with the RPMs?

Wondering how to confirm that I've got the batter hooked up correctly.

[stinkwheel]

[iridium]

Ok, so I connected positive of battery to the red wire under the seat.
Started the bike up and it measured about 5.84v I revved the bike and it went up to 6.04 or so.
No horn.
No neutral indicator light.
No turn signal indicator - although the switch is there, no lights connected yet.

I'm thinking that the red wire under the seat isn't the correct one?