Alternating L/R 4-way flashers

[RW74_Valiant]

Okay, so here's my take on a circuit to do that using one relay and four diodes for isolation:
The diagram shows a SPDT relay but you can use a standard SPST vehicle relay.
When the flasher is off, the small coil current goes through the low resistance of the unlit incandescent bulbs to energize the relay.

View attachment 65213

Can you explain the difference between SPST and SPDT?

 

[Martaine2005]

Put simply, spst has 1 output whereas spdt has 2 outputs.
Have a little read Here.

 

[AnalogKid]

SPST - On / Off

SPDT - Either / Or

ak

 

[crutschow]

Can you explain the difference between SPST and SPDT?

SPST has one contact the is normally open.
(Normally is relay unenergized).
SPDT has two contacts going to one wiper with one contact normally open and one normally closed.

 

[RW74_Valiant]

Okay, so here's my take on a circuit to do that using one relay and four diodes for isolation:
The diagram shows a SPDT relay but you can use a standard SPST vehicle relay.
When the flasher is off, the small coil current goes through the low resistance of the unlit incandescent bulbs to energize the relay.

View attachment 65213

After much research and contemplating, I've decided to use a DPDT relay for the rear and one for the front. Power between the hazard switch and the flasher will be used to trigger a standard SPST relay for constant switch on power to run the Amber rotating lights.