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Cb400 four indicator wiring

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mike the bike:
Connect a 12V supply to an orange wire.  All three LH indicators should light up.
Repeat the experiment with a light blue wire, all three RH indicators should light up.
if they don't, then you have an earth return problem.  They're normally earthed via the frame connections but I have wired in an earth from the lamp holders back to the green in the loom.
It's more reliable.

Oggers:
Had this recently. Orange bullet connector had come away in the mass of wires in the headlamp shell.

Dolomite_:
The grounds for the indicators are fine as I managed to get them to light up solid. But the only way I could get them to light up was by crossing the 2 connections on the indicator repeater (aftermarket one with no ground connection). Both connections do have a voltage and I get a reading on the gray wire in the switch on the bars but when I flick it left or right I lose the voltage on the gray wire and nothing shows in the blue/orange wire.

mike the bike:
Your test proves the lamps are ok and they're earthed correctly. I suggest the flasher relay is faulty.

Lobo:
..I’d agree with Mike - it sounds as though there’s corrosion / component fault within the repeater unit. Such a fault could well show 12v through a multimeter which typically tests at no load, but when earthed through the indicators .. ie having to carry 4A ... gives up.

The fact that ‘shorting’ out the repeater gives steady orange indicators suggests your loom / bullets / earthings are ok.

Just a thought... is your aftermarket repeater rated at 45W or so? (typical markings would be 2x21W + 3.4W). Some aftermarket (LED types) are rated 8W... ie overload protection might be kicking in?

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