73-87 Chevy _ GMC Trucks > Electrical

1897 K10 - No hazards, but blinkers work

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lazyMlazyK:
Hey guys, I've got a 1987 K10 that I'm working on getting the bugs out of recently.  The left and right blinkers work fine, but when I put the hazards switch on, nothing happens.  Could someone show me a diagram or a picture of where the relay is located for the hazards?  I have checked the fuse, and it's in fine shape - even ohmed it out to be certain.  I'm thinking the problem is either in the switch or in the relay.  I haven't had time to take apart the column yet to look at the switch, but would like to rule out the relay.

There's one round relay marked "224 12V WAGNER DOT on the fuse block - I believe that is for the blinkers?

There is also a small block with two relays on it under the radio area.  One of the relays is square/rectangular, and the other is round like the relay on the fuse block.  I've checked rockauto for hazard relays, and none of the relays offered there look like any I've seen so far under my dash.

Anyone here that could point me in the right direction?

bd:
The turn signal flasher plugs into the right lower corner of the fuse box.  The hazard flasher plugs into the "Convenience Center" located above the accelerator pedal on the interior firewall.  The three items that plug into the face of the Convenience Center are the seatbelt/ignition key/headlamp warning alarm module at the top, the horn relay at the lower left, and the hazard flasher at the lower right.  The hazard flasher and the turn signal flasher are interchangeable.  Swap the two flashers between the fuse box and the Convenience Center to see whether the problem follows the flasher.

lazyMlazyK:
Thanks for the diagram and explanation!  I've replaced the flasher relay in the convenience center, but the hazards still aren't working.  It looks like there's a plug on the back of that relay with two wires coming off of it - an orange and a brown (maybe purple or gray?).  They then go into a loom that goes up toward the dash and out of sight.  Is there a way to troubleshoot the hazard switch off of these two wires? I think to get to the switch, I'll need to take the steering wheel of, which I'd rather not go through that process if I don't have to.

bd:
Use an incandescent test light clipped to a good bare metal ground and probe the two socket contacts for the hazard flasher.  The contact labeled 140 in the diagram posted previously should be constant B+.  Does it illuminate the test light?

lazyMlazyK:

--- Quote from: bd on September 12, 2022, 02:39:48 PM ---Use an incandescent test light clipped to a good bare metal ground and probe the two socket contacts for the hazard flasher.  The contact labeled 140 in the diagram posted previously should be constant B+.  Does it illuminate the test light?

--- End quote ---
Using a 12v test light, neither one of the socket contacts would light it.

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