Updated Indicators

Neil W · Mar 10, 2023

Replaced the original bulls lugs indicators with a set of later s1000r ,310,1200 ones. To get them to fit I used a set of stems off a KTM , only issue is that the newer indicators use the smaller amber 12v10w bulbs with offset pins which are not available in 21w rating.

As a result the indicators are flashing at double rate so I will need to fit inline resistors same as you would with led indicators, anyone know off the top of their heads what Ohm resistors I need

Ian J Hartley · Mar 10, 2023

The easiest way would be to measure the resistances across the 10w bulb and the 21w bulb and subtract the lower value from the higher value.

Saves all that complicated mathematics like:-
Watts = voltage x current and voltage = Current x Resistance.……

But a value somewhere around 7 ohms for each bulb might do….. :augie

Neil W · Mar 10, 2023

Ian J Hartley said:
The easiest way would be to measure the resistances across the 10w bulb and the 21w bulb and subtract the lower value from the higher value.

Saves all that complicated mathematics like:-
Watts = voltage x current and voltage = Current x Resistance.……

But a value somewhere around 7 ohms for each bulb might do…..

Will give it a try when it is warm enough to go into the garage

Ian J Hartley · Mar 10, 2023

Having had a fresh look at the circuit.

In a 12volt circuit:-
a bulb of 21w will draw a current of about 1.75 amps having a resistance of about 6.8ohms
A bulb of 10w will draw a current of about 0.83 amps having a resistance of about 14 ohms.

I’m pretty certain that the indicator monitoring system monitors resistance as the LED conversions usually use resistance wire in the circuit.

Therefore in order to increase the current and decrease the resistance in the circuit you will need to place 13 ohm resistor across the bulbs contacts, so that the resistor is in parallel with the bulb.

Hope this make sense

Neil W · Mar 10, 2023

No bother thanks

Ian J Hartley · Mar 15, 2023

Have you made any progress?

I only ask because your set up is different than moving to a LED setup. It’s using conventional bulbs of a lower wattage and therefore a lower resistance, and the trick is to match the resistance and current in the circuit so the control module doesn’t see a fault condition. This may require some trial and error, because it’s not easy to measure or calculate the resistance in a circuit which has incandescent bulbs as the resistance of the bulb increases with temperature, and the circuit is only on briefly so measuring is more difficult. Each circuit of your indicator module has three bulbs, the instrument bulb (3w) the front indicator and the rear indicators (previously 21W now 10W) all in parallel.

Just like this.

Neil W · Mar 15, 2023

Tried wiring in a separate resistor for each indicator which did not work so bought two of these, wired one into front offside indicator and one into the front nearside indicator.

Works with the standard indicator relay and the smaller 10W bulbs, indicators and hazard warning rate is spot on . They are rated for led bulbs so that could be future upgrade

Ian J Hartley · Mar 15, 2023

Good job… Nice tidy result.

That’s what I thought would fix it. I eventually worked out that you would need about the same resistance as the 21w bulb across each circuit for balance. You would have needed a wire wound resister anyway for stability which is the path you chose.

This is what I eventually worked out.

GS Addict · Mar 17, 2023

No need for resistors.

Open the flasher and do this mod to the circuit board. Cut upper trace as shown.
Same applies for led indicators

Link to photo: https://photos.app.goo.gl/RyXME9rYWr2sunZN9

I can't share the pictures because I'm not a paying member.

Updated Indicators

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