The hazzard flasher lights wont activate. All other lights (head lights, blinkers, running lights, cab lights, brake lights, reverse and license plate lights) work fine. I have replaced the underhood fuse, the dash fuse, the hazzard light relay, and the multi-switch on the column and they still dont work. Any ideas? Thanks for any help.

 

Check your trailer connector...

 

I think there is a maxi fuse under the hood as well, you got it too?

 

On the 1996 truck, the hazard lamps have a separate flasher from the turn signals. Are you sure you got the right one?

 

maybe the hazard switch...

 

I replaced both flasher relays in the fuse box and the fuse in the power box under the hood. The hazzard switch is built into the mulit switch that includes the blinkers, wipers and hi-lo beam and that has been replaced as well. What on the trailer connector should I check?
Thanks.

 

Just pull it apart and see if it full of dirt and corrosion, a lot of times this is a good place to find a short or broken wire......

 

Looking at the schematic, it looks like one pin of the hazard flasher is supplied voltage from fuse C in the PDC. The other pin of the flasher is circuit L19, a pink/white wire that goes to the multifunction switch connector, terminal 13. The next place in the troubleshooting I would focus on is that L19 circuit. Make sure it has continuity from the flasher socket to the multifunction switch. I am betting that wire is either broken really close to the m/f switch connector, or its terminal is pulled out of the connector.