Turn signal woes

[khirodock2]

Help. I am new to this car so I don't know it's wiring history.

The hazards work. Turn signals don't. When I turn on my left signal, the left front comes on, but does not flash and BOTH REARS COME on as well without a flashing. Putting the right signal on gets me nothing at all.

I have replaced all the back bulbs, and still nothing. Could it be a bad flasher unit or am I looking at a wiring or switch problem?

Doc

[BQS4]

With PO (previous owner(s) ) having hacked at the wiring system in your car, you best bet would be to either down load the wiring diagram off the site, or get a FSM (factory service manual) and start going through wire by wire with an OHM meter

[blancojp]

Help. I am new to this car so I don't know it's wiring history.

The hazards work. Turn signals don't. When I turn on my left signal, the left front comes on, but does not flash and BOTH REARS COME on as well without a flashing. Putting the right signal on gets me nothing at all.

I have replaced all the back bulbs, and still nothing. Could it be a bad flasher unit or am I looking at a wiring or switch problem?

Doc

This is very common when you install an after maket wheel on a GT. Sometimes the studs that hold the wheel create a short on the turn indicator assembly. It is an easy fix since you only have to worry about just a few wires. I would identify the wiring and trace it back to the individual lights without the lamps on then one done, proceed to next steps as described below. This is all considering that you have standard Opel wiring, if this is an aftermarket fuse block and the car was rewired (like I normally do), then Gene is rigth and you do need to break out the meter and go to town on the wiring.

There are three areas you need to look at, the flasher unit, the turn signal indicators on the dash and the turn signal assembly on the steering column:
1) If it is a 4-prong flasher then both sides go to it and it will be easier to troubleshoot using a small jumper. I would remove the flasher unit prior to starting since the flash unit sole purpose is to apply and remove ground from the circuit. When you place a jumper in two of the flasher slots, only one set or side per say of lights should be on. If three lights come on with one jumper and only one comes on with the other side jumpered then you know where to look.
2) If the dash turn signal indicators are wired backwards, it is possible to have both lights on at the same time.
3) If the turn signal assembly is shorted or dammaged then you will have some erroneous problems when energized. To resolve this you will have to remove the steering wheel to get to the unit.

There is also an area you will need to look at, the hazzard switch. If this switch is wired wrong, you will also have erroneous results when energized.

[khirodock2]

Thanks, I just got a service manual, but it is for a 73 and mine is a 72. Doubt there is much difference.