The left turn signal on my 01 Bonneville would not turn on but it would flash when i put on the turn signal. When I removed the light bulb to replace it I found the connector was corroded and rusting so that could be your problem if not then you just might need to buy new wires. Heres the link:
http://www.trademotion.com/partlocator/index.cfm?action=getJointLocator&siteid=214858&chapter=&Sectionids=0,2295&groupid=2296&subgroupid=2385&componentid=0&make=28&model=Bonneville&year=2001&graphicID=FA00020&callout=6&catalogid=2&displayCatalogid=0
how do you remove the turn signal assembly on a 1989 Pontiac Bonneville
my turn flash don't in or outside of my 2000 Bonneville and cant find the flash in mycar
You have a bad relay. Your blinkers run on a different relay than you hazards do.
One or two front turn signal bulbs is busted. Check your front turn signal bulbs and replace it.
The 1995 Pontiac Bonneville turn signal flasher relay switch can be found beneath the drivers side dashboard. The turn signal flasher relay switch will be above the accelerator pedal.
Usually it's because one (or more) of the signal bulbs is burnt out. It is also possible that the turn signal relay is faulty.
You could be hitting the flash feature on the turn signal arm when you use it.
may have bad bulb
Turn signal indicators are lights. The flash to tell you, or indicate, that a turn signal is on, and which way the lights are flashing.
Might be turn signal flasher
The turn signal flasher on a 99 Bonneville is either behind or next to the fuse box. Remove the plastic panel mounted with 3 bolts left of the steering column to be able to see it.
You need to replace the turn signal bulb. When bulb is burnt out the turn signal will flash faster.