need relay wiring for defroster, seats

Could someone tell me how to correctly wire a relay for a negative trigger defroster and heated seats. I would like to have the rear defroster and heated seats be activated by the viper 5901 when needed (below 50). I've seen where some have wired directly to the defroster wire, but I think a relay would be required if triggering two seats and the defroster. Especially if latched. And I believe all three wires from the push buttons should be diode isolated with the bands toward the viper. Correct? Thanks in advance.

Bands on the diode towards the viper, correct. A relay would be wired like this. 85 - status outpit 86 - 12v 30 - ground 87 - defroster outputs

; Thanks!  I've heard of some relays having a diode to avoid a voltage spike. I don't need one of those do I? Thanks again.

any relay will do, you can just add a diode across the terminals later on.

the correct way of doing this is

85 - defroster output aka second status

86 - constant 12v87 - constant 12v fused at 15 amps30 - connect one wire off and place 2 diodes inline, bands on diodes towards relay, then from each relay, one will go to defrost, one will go to heated seats.

Ted

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert

Thanks Ted,  I've got two separate buttons for heated seats. One for drivers, one for passenger. Won't I have to use separate wires for each to retain individuality in normal use? And to reiterate, this is a Neg. trigger system. Doesn't one of the relay contacts have to go to ground to give it a "heavier duty" ground than the status output wire?  Thanks for the reply.

sorry bout that. thats what happens when i post too early in the morning

85 - defroster output aka second status

86 - constant 12v87 - chassis ground30 - connect one wire off and place 3 diodes inline, bands on diodes towards relay, then from each diode, one will go to defrost, one will go to each of the heated seats.

Ted

2nd Year Tier 1 Medical School

Still installing as a hobby...pays for groceries

Compustar Expert