I have a Iveco 65c15 indicators on rhs flash fast lhs flash at normal speed so do the hazards any ideas

Only the bulb is linked with those seperate items the bulb runs both blinker and hazard normally one goes both go when u have tufrn signal on inside if u hear it flashing fast its ur bulb

Do you have a burned out bulb, that will affect the speed of the flash

fast flashing indicators a fault globe at one end
when hazards are used the current load from the additional bulbs slows down the flash action

check fuses and flasher relays..

check all your bulbs are ok. change bulbs only as a pair not just one side.and of the same make .and company.

you have a bad earth or ground if your american (HI) if this is a peugeot then its most likely a fault with the back light ,its a common earth between all the bulbs and i bet if you remove the back light bulb holder thing you will see the other bulbs glowing as the indicator come on ,also the stop light will light up the other bulbs clean the bulb bases and grease the bases with vasaline then find the common earth and run a new cable from a bolt to the chassis nearby and iam sure it will cure it

sensor is to frequently installed

It could possibly be that one of the indicator bulbs has broken , when this happens there is a higher voltage drop going through the remaning bulbs which makes them blink faster.
Try switching on your hazards and walking around to see if all the indicator bulbs are working.

bad bulb..ground to fast side is corroded or socket/ bulb compromised

With out doubt it is the Indicator Flash Unit (Found near fuses) its a plug type box. you pull it out, plug in new one and it works. (Kinda looks like a strange adaptor plug you would put in a power socket.