Hi all,
I have another project I am needing direction with.

I have a 2014 Chevrolet Silverado that I am adding tow mirrors to. I am needing advise for two things.

1.) Heated mirrors- They need 12vdc to power on.
What I would like to do is have a key on only power supply(I have found one) that sends power to a thermal control or switch that passes power at a given temperature. Like 32°F. Anyone know of a simple solution for this?

2.) The led in the picture is what that I really would like to be powered by a few different 12vdc sources.
Inline with one of the 12vdc I would really like to have a control or something that Can have a programmed output that can be used to make the led blink a number of times at a given speed?
I hope I have explained this in a way that is understandable.

Any help is appreciated. Thank you for your time.

 

There is not enough information in your Post to
even begin to make a guess at what You are working with.

Are these Mirrors "Aftermarket", or Factory-supplied/manufactured ?

Can You post the instruction-manual for the Mirrors,
and/or,
take some Pictures of what you are working with ?

It "sounds like" You have purchased some aftermarket Mirrors which
have built-in-Heaters and LED-Side-Markers,
and You want the Heaters to turn-on automatically when the Temperature gets below ~40F-degrees,
and you want a Switch, inside the Cab, which will turn-on the Flashing-Side-Markers.
Is this correct ?

How much Electronics experience do You have ?

Do You have access to the Wiring-Schematics for your model of Truck ?
.
.
.

 

There is not enough information in your Post to
even begin to make a guess at what You are working with.

Are these Mirrors "Aftermarket", or Factory-supplied/manufactured ?

Aftermarket

Can You post the instruction-manual for the Mirrors,
and/or,
take some Pictures of what you are working with ?

The picture is the wiring diagram for the mirrors.

It "sounds like" You have purchased some aftermarket Mirrors which
have built-in-Heaters and LED-Side-Markers,
and You want the Heaters to turn-on automatically when the Temperature gets below ~40F-degrees,
Yes

and you want a Switch, inside the Cab, which will turn-on the Flashing-Side-Markers.
Is this correct ?
I would like to figure a way to have the white led on the front of the mirror to be powered in the following ways: Reverse, door ajar, (2) aftermarket alarm outputs.
The aftermarket alarm outputs would be tied to the some sort of controller that could make the light flash as I was speaking of previously.


How much Electronics experience do You have ?

Not much, but I can solder.

Do You have access to the Wiring-Schematics for your model of Truck ?
.Do I need the truck wiring diagram after posting the diagram for the mirrors?
.
.

 

This will not be a simple project.

These Mirrors "may" be designed to interface with Factory-Wiring,
or maybe not at all.

They already contain a "Temperature-Sensor", but with no description or specifications.
This is very convenient, but will require some testing to determine what type of Sensor it might be.

The Mirror-Adjustment-Functions will require an aftermarket "Joy-Stick" type Switch,
and, a Left-Right-Selector-Switch,
and, appropriate Switch-Mounting-Panel fabrication,
or, drilled-holes somewhere in, or under, the various plastic Interior-Dash-Panels,
or, drilled-holes somewhere in the Drivers-Door-Panel.

The Side-Marker-LEDs can be tied into the Factory Turn-Signal-Circuits,
but this will require running wires back to the Factory Trailer-Wiring-Plug.
.
.
.

 

To simplify this I have the wiring and switches for controlling the mirrors no worries there. I also know what wires are needed to power the white led and orange led.

My debacle is how to power the white led with different 12vdc power sources in the manner intended.

 

But You have not specified what, and how, and why,
that You want these Lights to do specific things, and when NOT to do specific things.

And then there is the second, separate project, of figuring-out the Heaters and Sensors.
.
.
.

 

I would like to figure a way to have the white led on the front of the mirror to be powered in the following ways: Reverse, door ajar, (2) aftermarket alarm outputs.
The aftermarket alarm outputs would be tied to the some sort of controller that could make the light flash as I was speaking of previously. I know what wires are needed. I'm unsure of what device I need to program and make the white led blink as desired.

 

Any help is appreciated. Anyone have any tips on what devices that can be used?

 

"KeyOn" power for the heaters is very simple. In the vehicle, that the heater feed from the accessory connection in the fuse block.

 

"KeyOn" power for the heaters is very simple. In the vehicle, that the heater feed from the accessory connection in the fuse block.

Thanks!

 

Any ideas on how to power a light with multiple 12vdc sources is greatly appreciated.

Also I read there are diodes that allow power to bleed past and others that are made better that do not? Is this true? I do not want to have any power going in the wrong direction.

Thanks!

 

If I have to I'd pay for ideas...

I'm sure someone here can help. You guys are tech geniuses

 

There is 'Steering diodes' that may be able to do it possibly?

 

Any ideas on how to power a light with multiple 12vdc sources is greatly appreciated.

Also I read there are diodes that allow power to bleed past and others that are made better that do not? Is this true? I do not want to have any power going in the wrong direction.

Thanks!

There are diodes that do have some reverse leakage, mostly those are defective diodes..
If you use a diode with adequate current handling rating and an adequate reverse voltage rating, any number of them can provide a path for current to light the lights, with no interaction, either real or theoretical. In the automotive electrical system there will be no measurable reverse current flowing. The diodes do need to be installed with the correct polarity, which is simple to verify at installation.

 

There is 'Steering diodes' that may be able to do it possibly?

Thanks I'll look into these. I'll check Mouser and see what they have.

 

There are diodes that do have some reverse leakage, mostly those are defective diodes..
If you use a diode with adequate current handling rating and an adequate reverse voltage rating, any number of them can provide a path for current to light the lights, with no interaction, either real or theoretical. In the automotive electrical system there will be no measurable reverse current flowing. The diodes do need to be installed with the correct polarity, which is simple to verify at installation.

I really appreciate you providing info on these Key specs. In regards to reverse current flow, there is a Gm forum where folks found using diodes on the body control module terminals useful. Most folks go for the lighting mods.
With that said there have been failures of the bcm due to the diodes failing to stop current after months of run time. Hence my reason for asking for assistance. You have guided me in the correct direction

Thanks

 

Parts selected with adequate margins on critical parameters seldom fail, if they were good quality parts initially.
Unfortunately there are those who sell what some producers classify as rejects. Those parts will fail after a while.
So the TS needs references for an honest company that onoly sells good parts.

 

Ok so I am checking Mouser for the diodes. I'm confused on the specs. I'm sure it is due to my lack of electronics knowledge. Are these rated for 30 amp or 1 amp?

 

Good question about that. The clue is in "the average" current rating, which is the continuing time current rating. That is the current that will be in your application, while the diode is actually passing current.
The 30 amps is the peak current that it can handle during ONE 8.3 millisecond pulse. (0.0083 seconds. one time.) So that does not do anything for you at all.

 

Any ideas on how to power a light with multiple 12vdc sources is greatly appreciated.

What are the dual sources? Are they both from the auto electrics or are you talking about an external power source?