rear defrost

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joebubba

Copper - Posts: 107

Joined: December 21, 2005

Posted: December 25, 2009 at 4:56 PM / IP Logged

tegguy wrote:

does 85 and 86 matter which is positive and which is negative?

Nope, as long as the relay doesn't have a diode across the coil.

i am an idiot

Platinum - Posts: 13,670

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 25, 2009 at 5:35 PM / IP Logged

There is a European standard that states 85 is ground. I have never seen one, but some relays do have an internal diode. As stated earlier, if there is a diode across the coil, it does matter which leg of the diode gets the positive voltage. If the relay has an internal diode, it will be installed where 85 is ground. I always use 85 as ground, just incase the relay has an internal diode.

tegguy

Copper - Posts: 155

Joined: December 21, 2009

Location: Florida, United States

Posted: December 25, 2009 at 6:16 PM / IP Logged

Ok thanks for the advice I am just now learning how to use relays

KarTuneMan

Platinum - Posts: 7,056

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Joined: December 14, 2004

Location: Isle Of Man

Posted: December 25, 2009 at 7:25 PM / IP Logged

i am an idiot wrote:

I read earlier that you may want to be able to turn the defrost on without the vehicle being remote started.

This is what I have been trying to understand.... WHY?

If you are defrosting the rear glass... arent you going somewhere? If you are just wanting to warm your hands on the rear window, you can buy hand warmers at Cabelas.

tegguy

Copper - Posts: 155

Joined: December 21, 2009

Location: Florida, United States

Posted: December 25, 2009 at 7:31 PM / IP Logged

Well the reason why I was thinking this is my car likes to fog up even if it isn't that cold out so I figured why waste gas if I don't need to warm or cool the car?

i am an idiot

Platinum - Posts: 13,670

Joined: September 21, 2006

Location: Louisiana, United States

Posted: December 25, 2009 at 7:37 PM / IP Logged

It is always good to have your rear glass fog free. It makes it easier for everyone to see what you have in the car. Oh wait, that might not be a good idea.

tegguy

Copper - Posts: 155

Joined: December 21, 2009

Location: Florida, United States

Posted: December 25, 2009 at 7:39 PM / IP Logged

Well the most times I would use it would be leaving work on a military base so it really isn't an issue with theft there.

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: December 25, 2009 at 8:16 PM / IP Logged

You know, since the start of this thread i've wondered the exact same thing kartune did! Why? LOL!

You'll lose gas yes, but an active relay with the car switched off drawing at 7.5 amps constant, could take a toll on the battery!

commit your way to jehovah and he will act in your behalf. psalms 37:5

tegguy

Copper - Posts: 155

Joined: December 21, 2009

Location: Florida, United States

Posted: December 25, 2009 at 8:19 PM / IP Logged

t&t tech wrote:

You know, since the start of this thread i've wondered the exact same thing kartune did! Why? LOL!

And if you would have read all the post you would have seen I provided a reason as to why I was looking for this.

t&t tech

Platinum - Posts: 2,608

Joined: October 05, 2008

Location: Trinidad and Tobago

Posted: December 25, 2009 at 8:20 PM / IP Logged

Point taken! Cheers! i do apologize for my idiotic thoughts!

commit your way to jehovah and he will act in your behalf. psalms 37:5

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