My hvac wiring harness is all hacked up and the resistor pack is gone. I want to wire up the heater motor on a rocker switch. IS tere any way to do this and get a single speed blower going? having two speeds would be nice. Also the high speed relay has long been gone.

 

If you still have the resistor pack put the switch between the brown and the blue wires
If you don't you are going to need a relay

see
http://92b4crs.tripod.com/86wiring/dia-pics/63-0.jpg

 

Not a good idea to run any heavy electrical load without go'n through a relay......

 

can you show me a diagram of how to wire in the relay? the pack is long gone.

 

so te brown wire give me power. can i just connect the brown wire to the blower motor wit a switch in between? like brown wire to purple wire?

 

No..... You don't want to wire without a relay......

I threw this together for ya;





You can get a relay at any auto parts store......

 

Read the diagram

Only the low current power went through the fan speed switch ( via the resistor pack ) The full batt power for Hi speed fan was switched through the blower relay because as noted it could burn up the switch and wiring ( and your car )

So using Restrorob's diagram above
you put a switch on the existing brown wire and wire it to terminal 86 on the new relay to operate it
Then you get 12V from a good source (with a 30A fuse ) run it to terminal 87 on relay then wire from terminal 85 to the fan motor

 

The best place to find the 12v source for the fan is at the junction box usually located next to the battery. Follow a wire attached to the positive side of the battery and that will lead you to an insolated, mounted bolt that has several wires attached to it. Those are constant hot. Disconnect the battery before messing with the terminal .If you touch ground and a live wire with a wrench you could get hurt. Tap into that for your power to the relay # 30 prong. The 30amp fuse goes on that wire fairly close to the source.

 

the picture is awesome. thank you. can you translate it to my exsisting harness? where could a get the ground, 12v power, 12v switched power, i guess i am asking to tell me how the colors match up? i think i can use the wires that are still in the car. and id just be putting arelay in the place of the resistor pack? i really appreciate it.

 

everything is still in place up to the resistor pack. which the guy cut out and threw away. so I am assuming the blue wire is my medium speed hot wire? I run that into the 30 terminal? then a lead to the fan motor? then ow do i wire up te ground? is there anything there to wire into, or do i just run new wires?

 

With a test light; Hook to positive battery post, Probe the cut wires, If the light illuminates that probed wire is a ground source.

With a multimeter set on DC volts; Put pos. (red) test lead on pos. battery post, Probe wires with neg. (black) test lead, If the meter shows battery voltage the probed wire is a ground source.

Go back and slowly read vetteoz and Ron's post again, They summed up pretty well what you need to do....... Take your time and study the diagram as well......

 

 

That is pretty awesome! I found some one who has a resistor pack he will give me. so i may not need to do any wiring. can i get a pigtail at auto zone? or junk yard? also can i relocate the resistor pack? i know it gets hot, but how hot? can i mount in the dash?

 

 

rockauto has a bunch of connectors and parts for these cars including the resistor with included pigtail for 12 bucks

DORMAN Part # 973430 {#526897}
Includes Connector; Air Conditioning

 

so for now i could just get a pigtail and wire it back up and leave the resistor pack somewhere behind the dash? and no fires?

 

i dont personally know where it supposed to be my hvac went in the trash like 15yrs ago. but i know some of those have to be in the air stream to keep cool and that looks like one of those from the pics on rock auto