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Koso speedometer wiring

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siNN
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Koso speedometer wiring

Post by siNN on Tue 6 Nov - 10:04

Hey guys, 

So I've got a model EX-02 Koso, heres the wiring instructions

I'm struggling to get my head around that the original dash had 2 wires for every light, Am i right in thinking i only need to take the positive feed for all the lights and the negative for the neutral?

also the coolant temperature guage wires, the koso has one wire marked +/-
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eternally_troubled
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Re: Koso speedometer wiring

Post by eternally_troubled on Wed 7 Nov - 21:24

Right. Doesn't look too bad.

Firstly to explain:

The oil pressure, neutral and sidestand lights all have a permanent positive (+12 V) connection and are 'negative switched' i.e. the negative (earth) connection is switched to control the light.

The turn signal(s) and the high beam all have a permanent negative (0 V, earth) connection and are 'positive switched' i.e. the positive (+12 V) connection is switched to control the light.

So some of the switched connections are 'positive' and some are 'negative'.  The KOSO box has both permanent positive and negative connections, so can deal with either type of input, as long as it is connected to the right place.  The little + and - signs on the KOSO diagram indicated which inputs are  positive and negatively switched.

Thankfully all the inputs to the KOSO match up with how the CB500 wiring works.

Because the KOSO has separate positive and negative connections you will only need to wire up one wire from/for each light - the important point is selecting the correct one!

So this leads us to the connection table:

FunctionHonda Wire colour KOSO wire colour
Right indicator   Solid light blue               Blue  
Left indicator     Solid Orange                  Orange
Oil pressure       Blue with red stripe        NOT CONNECTED  
Neutral              Green with red stripe      White
High beam         Solid Blue                      Yellow
Sidestand          Yellow with black stripe   NOT CONNECTED
Temp. gauge      Green with blue stripe    Yellow/white
Positive power /12 V    Black with brown stripe   Red
Negative power/earth     Green Black
Engine light/ MIL     NOT CONNECTED Purple

Note I have also provided some connections for the power - there is a possibility you will have to put a extra ground wire in which goes back to the battery and/or an extra power connection straight from the fusebox, but it seems stupid not to use the power that is already there (it might well work and is fused already).

Before doing this use a multimeter to check that the black/brown wire on your bike is connected to +12 V and the green wire is connected to 0 V/ earth/negative. I don't know why it wouldn't be the case, but it would be a good sanity check.

Also, it might well be sensible to remove the battery before hacking around with the wiring (reduces the chance of problems!).


Do check my working!  If there is anything that doesn't make sense then do ask - I might have made a cock up!

Best of luck...
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siNN
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Re: Koso speedometer wiring

Post by siNN on Sat 17 Nov - 22:35

Great write up mate, installed and works perfectly, I couldnt get power using that earth scratch so ive just found a ground on the forks and also I connected the oil pressure wire to the koso engine warning light because... because. 

Thank you muchly!  cheers
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eternally_troubled
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Re: Koso speedometer wiring

Post by eternally_troubled on Sun 18 Nov - 13:07

@siNN wrote:Great write up mate, installed and works perfectly, I couldnt get power using that earth :scratch: so ive just found a ground on the forks and also I connected the oil pressure wire to the koso engine warning light because... because. 

Thank you muchly!  :cheers:

Cool, glad to hear it works. I did think about suggesting that (oil pressure light -> engine warning light) but I didn't know if it would work, so I thought it best to try and keep it simple. After all, if the oil pressure light comes on then your engine is certainly trying to tell you something...

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