Suggested Wiring for Seat Heaters

[Ol'Blue]

I currently have my seat heaters wired per the attached diagram except I have the "to vehicles switched 12v (+) 10A" going to constant as I believe running this amount of current through my ignition switch would overload it, right?

Is there a way to wire the relay for switched power to trigger the relay when I turn on the key?

Or do I need another relay up stream?

Thanks,

 

[CA10Cruzer]

what is the total current draw for the heaters?

 

[CA10Cruzer]

you could use a relay to feed the seat heater system and reduce the load of the switched source
30 would go to battery feed/ 87 to seat heater system/ 86 to switched source and 85 to ground
hope this helps

 

[Steve83]

If the documentation doesn't specify the actual current draw, use any DMM to measure Ohms through each heat pad. The kit I used has two 6.7 Ohm elements, which at 14V draw 2A ea (on Hi), so 4A.



Depending on which ig.sw. terminal you put them on, and what's already on that terminal, and what's turned on when you use the seat heaters...
The ig.sw. could probably handle the added load. But considering how cheap & easy it is to add some relays, it's safer to do that.