wiring heater to toggle switch

[robert1973]

i posted this on another forum also but Is this a bad idea? I just need a temporary way to power the blower motor through the winter. I plan on buying a painless wiring harness to do whole jeep come spring time, I would like to run a wire straight from pos bat cable to a toggle switch and back to blower motor. I understand it will be full blast all the time and thats fine. I know i should put a fuse inline right after battery, will take suggestions on how many amp to use also. Is this a safe thing to do? I also have a ground from the heater box going to the neg pos terminal on battery already.

 

[Cheepjeep85]

well its better to fix it properly but to get you by you should be fine. just do as you said and use an inline fuse, use some pretty heavy gauge wire and a heavy duty switch, also make sure you insulate the wires going through the firewall. or to make it even safer you could use a simple bosch 4 pin relay.

 

[nctom]

Plus 1 on the relay idea. They are really pretty simple to wire and will save you the headache of a fire all up under there.

 

[robert1973]

Well tell me if this is good solution. I just finished it up. I ran a 20 amp self resetting breaker 6 inches inline from the pos bat terminal and a 20 amp toggle swithch in the dash. All the wire is 10 ga. wire. I ran the heater for good twenty minutes straight and all the wires were very nice and cool and never got warm at all, so i think i am good. And let me tell you what, that blazer blower motor is something serious. Wow!!! Talking blast furnace inside with it being on full blast It will be wired right come few months. Am gonna get a painless wire harness for whole jeep, Am afraid to start messing with too much under the dash, the PO really got creative with some self wiring. I've removed as much unnecessary wiring as i can from everywhere. Thanks for the replies.

 

[CJim7]

I did that last winter cause I was to lazy at the time to mess with replacing the switch in the dash

So I wired up a relay and an inline fuse to a heavy duty switch in the cab. The blower motor now goes from 'off' to 'full blown typhoon' with the flick of a switch...

...my blower motor is out of a Suburban with A/C

I suppose I should replace that switch so I have 'low' and 'medium'

 

[IOPort51]

Here is my question. the 77 has the blower motor on the inside of the firewall, as far as I know. this means that with the ground wire to negative, or ground, the Chevrolet motor will be turning backwards of the direction the blower needs to turn. did you wire the ground wire to the positive terminal and the high speed to ground to make it run in the proper direction??

Well tell me if this is good solution. I just finished it up. I ran a 20 amp self resetting breaker 6 inches inline from the pos bat terminal and a 20 amp toggle swithch in the dash. All the wire is 10 ga. wire. I ran the heater for good twenty minutes straight and all the wires were very nice and cool and never got warm at all, so i think i am good. And let me tell you what, that blazer blower motor is something serious. Wow!!! Talking blast furnace inside with it being on full blast It will be wired right come few months. Am gonna get a painless wire harness for whole jeep, Am afraid to start messing with too much under the dash, the PO really got creative with some self wiring. I've removed as much unnecessary wiring as i can from everywhere. Thanks for the replies.

 

[robert1973]

My jeep has a fiberglass body installed by PO. My blower motor is the one that goes through the firewall. Not sure if maybe late 77 jeep switched to new heater box of the 78 and later design or the PO installed a later model heater box. The motor i installed has a single power post and from what i have read grounds itself to the heater box itself, although i did run a dedicated ground from one of the screws to be sure it had a good ground.