Relays to control turn signal/parking lights?

Thread Starter

kwest944

Joined Feb 27, 2020
2
I understand basic use of 12 volt auto relays but am stumped with this one...

Here is the scenario:
- Switch in dash, which when on powers parking light bulbs
- parking light bulbs are also the turn signal bulbs

Possible states are:
1. parking lights off, turn signal not engaged: Bulbs not lit
2. parking lights off, turn signal engaged: Bulbs blink
3. parking lights on, turn signal not engaged: Parking lights on
4. parking lights on, turn signal engaged: Bulbs blink

I know I need two relays but am lost at how to accomplish.
 

bwilliams60

Joined Nov 18, 2012
1,350
What kind of car is this. Been in automotive for a couple of years and as @shortbus says, usually dual filament bulbs are used and no relays. This isn't homework by any chance is it? No worries either way. Just need to know year/make/model to give you informed answer.
 

eetech00

Joined Jun 8, 2013
2,048
I understand basic use of 12 volt auto relays but am stumped with this one...

Here is the scenario:
- Switch in dash, which when on powers parking light bulbs
- parking light bulbs are also the turn signal bulbs

Possible states are:
1. parking lights off, turn signal not engaged: Bulbs not lit
2. parking lights off, turn signal engaged: Bulbs blink
3. parking lights on, turn signal not engaged: Parking lights on
4. parking lights on, turn signal engaged: Bulbs blink

I know I need two relays but am lost at how to accomplish.
Hi

I think this is the correct logic...

eT

1582853435660.png
 

vu2nan

Joined Sep 11, 2014
165
I understand basic use of 12 volt auto relays but am stumped with this one...

Here is the scenario:
- Switch in dash, which when on powers parking light bulbs
- parking light bulbs are also the turn signal bulbs

Possible states are:
1. parking lights off, turn signal not engaged: Bulbs not lit
2. parking lights off, turn signal engaged: Bulbs blink
3. parking lights on, turn signal not engaged: Parking lights on
4. parking lights on, turn signal engaged: Bulbs blink

I know I need two relays but am lost at how to accomplish.
Hi kwest944,

Here's the schematic.

untitled.JPG

Regards,

Nandu.
 
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