Remote Sart-Relay for Heater

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Ron_toolman

Member - Posts: 32

Joined: March 16, 2002

Location: Canada

Posted: February 25, 2005 at 3:13 PM / IP Logged

Hi ...... Just wanted to check with others. Anytime i installed a remote starter i would always install a relay from the Accessory wire to the Heater Blower Motor, just incase someone should turn the switch off after driving awhile and forget to turn it back on. This way the car would always be warm. Anyway is there a diagram that you can suggest for hooking it up this way. I was told that i should be also installing a diode ? ...... Dunno why. Any Info. would be appreciated. Also the last one i installed was a Pro Start, can someone suggest something else ? or have you heard of Directstart, any good ? (http://www.12voltshop.com/cadetails.asp?prodid=CS124&cat=12&path=1,12)

Thanks ...... Ron.

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brcidd

Copper - Posts: 274

Joined: January 07, 2005

Location: Ohio, United States

Posted: February 25, 2005 at 7:47 PM / IP Logged

I'd be careful doing that- A blower motor can consume a bunch of amps- especially a nearly worn out one- if you are using an accessory wire to power it- you will nearly overload that wire- would hate to see an ignition wire cause a fire- or continually blow a maxi fuse or fuseable link. All blower motors that I know of run on "high" (full 12+ volts) speed through a relay to a battery hot completely separate from any ignition wires- so If you plan to do this, then wire it that way. I don't worry about them forgetting to turn blower up- they only forget once- plus what do you do when they forget to put it on windshield defrost? instead of heater- for those ice storms and frosty mornings? Just my thoughts

Brcidd - Engineer That Does Remote Starter Installs on the side.

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Ron_toolman

Member - Posts: 32

Joined: March 16, 2002

Location: Canada

Posted: February 25, 2005 at 9:18 PM / IP Logged

brcidd wrote:

I'd be careful doing that- A blower motor can consume a bunch of amps- especially a nearly worn out one- if you are using an accessory wire to power it- you will nearly overload that wire- would hate to see an ignition wire cause a fire- or continually blow a maxi fuse or fuseable link. All blower motors that I know of run on "high" (full 12+ volts) speed through a relay to a battery hot completely separate from any ignition wires- so If you plan to do this, then wire it that way. I don't worry about them forgetting to turn blower up- they only forget once- plus what do you do when they forget to put it on windshield defrost? instead of heater- for those ice storms and frosty mornings? Just my thoughts

I understand what your saying, but the acc. wire is what triggers your fan to come on anyway right ? .... So i just ad a relay and the acc. wire turns it on and the main 12 volts comes from a fused +12 volt supply, i would think it's safe. As for someone turning the heater to the floor rather than defrost, atleast it's still warm. I also do the same for the rear defogger. If it were just me driving the vehicle i would't bother, because like you say you will only forget once, but tooooo many drivers to blame. Thanks for your suggestion .......

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brcidd

Copper - Posts: 274

Joined: January 07, 2005

Location: Ohio, United States

Posted: February 26, 2005 at 7:42 AM / IP Logged

What you describe is how it works- but the switch would still have to be set to high-- what you really want to do is by-pass a fan switch that is in any mode other than "high". To do that you would have to energize the blower motor relay- at the blower motor (it is usually within six inches of trhe blower motor) by giving it a +12 volt "out when running" of your R/S modlue- so. if you wired your accesory wire diectly to the blower motor relay +12 volt coil side- you could probably do what you want- for winter. But.. your control head would NOT be powered for things like turning on the A/C compressor etc for summer. If you have climate control, I would not bother to try to turn the fan on- since it is automatic- unless your driver's turn off their climate control modules too...which they may need psychological help then....

some cars have relay modules for the blower motor- which are mounted along with the resistor board (for the lower fan speeds) so you would need to research which wire to tap into to power the built in relay.

The best way would be to use you neg out while runing wire- (diode isolated) to energize the coil at the blower relay any time the R/S is active and still use the accessory wire to run the control head- any other combination would force the blower to high anytime the car runs- which would be bad.....

The new "do it all" modules for databus (newer cars/trucks) will turn on the seat heaters- rw defrost, heated mirrors etc when it gets below 23 deg f.--

I have though about turning on rear defrost- but don't wish it on every time I remote start- plus I live in the country- takes five miles til I need to look out the rear window

Brcidd - Engineer That Does Remote Starter Installs on the side.

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Remote Sart-Relay for Heater

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