Larger globes (wattage) or aload resistor rueby ,i fixed a patrol yesterday with the same problem

Trailer plug will only come into play if there is a short or if it is plugged in and is faulty

Yeah its got a towbar. Didnt think of that. I would have thought that corrosion, and therefore a bad earth would make the indicators go slower. Still ill check that bit out.

Looked for a second indicator relay/can. Its only got one, so thats not it.

Has it got a towbar. If so check for corrosion in the socket. The problems of flash rate is usually something wrong with the total load of all the globes in the circuit.

Corrosion in the trailer plug will cause a change in impedance or even a wrongly wired socket.

DD. ill check for a second flasher relay and check that. it cant hurt.

On holdens/izuzus im pretty sure they run off one can ,your probably right though dd :)

hazards use a different blinker can

Might still be the wrong globes ,cos if they arnt the right size eg 12v18w ,12v5w

Might be worth comparing globes from the two cars if they are suposed to be bigger than whats in it that will explain why it works properly with the hazzards on but too quick with one or the other side flashing

Try some larger wattage globed and see if that helps

Good luck

Righto update
I have replaced
indicator relay/can - OK
replaced indicator stalk and module - OK
checked the globes for correct voltage - OK
check hazard switch for correct function - OK
Pretty sure its not an earth somewhere as all globes are flashing at equal speed and brightness. Other lights (eg brakes) are not coming on.
Checked brake lights, tail lights and reverse lights with the indicators on . it makes no difference and they are all fine as well.

Funny thing is, its exactly the same both left and right, and if I put on the hazard lights, then it flashes at the correct speed.

It has to be a resistance issue somewhere and at a central point, Since when I put the hazard lights on it works correctly, ie the resistance is right. Single side, half the resistance so it flashes twice as fast.

My last resort is to fit an inline resistor on each side, like the ones you should use with LED lights.]

Any one got any ideas to check before i shell out for those?

Thanks for that. The steering column comes off tommrrow to see if the hazard switch is playing up.

I have an identical model car that i have been pilfering parts off. The indicater relay/can was working fine in the old one, so i know its fine.

Ill check the globes also for correct voltage. They seem bright enough. ie not too dim or too bright.

ill post back with my results after the hazard switch effort.

That happened to my 1200, the winkers were blinking much too slow. One of the bulbs was burned out.