79 TA - access to switched Hazard light circuit wire at steering column
 

Hello All,

I am asking for help with wire color and a good access point to connect a good relayed 12 volt signal to the hazard light circuit on my 79 TA for a new keyless entry system.

I am installing an aftermarket keyless door lock system and the system has the ability to signal lights at lock and unlock functions. I believe the only way to get lights front and rear to simultaneously flash on all four corners of the car is to tie into the hazard circuit. I figure the easiest way to get all lights with one signal is to tie into the hazard circuit. I am trying to locate the hazard circuit wire on the load side of the hazard switch exiting the steering column. Or, the load side of the hazard flasher at the fuse box. My schematic shows that it is a brown wire between the hazard flasher at the fuse box and the steering column and a brown wire to all signal lights on all four corners.

When accessing the connector terminal on the brown wire at the steering column with a test light shows 12 volts flashing when the hazard flasher circuit is on. However, accessing that wire with a good relayed 12 volt signal (full amperage with relay used) from the keyless brain box doesn't get me any signal to the lights.

At one point I took the hazard flasher out to access the load side terminal of the flasher and I could get good signal there to control all lights at all four corners of the car. However, now, I cant get that to work. All fuses are good and hazard circuit works fine.

I am not overly familiar with how the hazard system overrides all other circuits to the same lights, so any ideas of how to get lights at all four corners would be helpful.

Thank you.

In further diagnosis of the hazard system via lighting schematic for 79 it looks like all switching of the hazard circuit is done inside the steering column with the hazard switched power to all 4 corners.

I have ordered in some diodes so I can one-way power all for wires to the 4 corners through the power lock module.

I will test run it when I receive the diodes to monitor success.

Thanks for reading.

Park/tail lights won't be as bright as turn/hazard.... But sure would be easier to wire up

Clay

It would be much easier to tie into parking lights but not nearly as bright - also I have the modern LED headlights with the driving light capability and they also have the amber turn signal dual circuit as modern headlights do. The option to have the amber portion of the headlights flash is through the turn signal or hazard circuit only. - Much brighter and better with the headlights also flashing at lock / unlock.

This will be pretty easy anyway. In theory - using diodes on each signal wire - I should just have to tie into the 4 turn signal wires at the steering column connector and run them into the one trigger wire from the power lock module.

I am doing all this with the dash out so ther is real easy access to everything.

For anyone interested - here are some related photos.

Light switch schematic - note that the Directional Signal Switch square is the connector into the steering column as the switch is in the column.

Photo of the connector with labeled wires - also note that the dark green horn to horn relay wire is a GROUND Trigger. Also the key buzzer wire next to the horn is also GROUND triggered.

I completed this a while back but did not update this thread for anyone interested.

I wired in the diodes to the four in column signal circuits - and it all works great.
Lock or unlock the doors via remote and all four corners flash
Trunk release - all four corners flash
To the traditional guys - probably not for you but I like it.

Labeled Pictures of wiring
 

For anyone interested - here are some labeled photos of wiring changes.