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Discussion Starter · #1 · (Edited)
HELP:Any voltage pts, that I can take a low voltage supply from?

Hi all :cheesy:,

I want to install a parking sensor and it requires a 12v 500mA supply . Im intending to take the power lead from the radio and pass it thru a 12v Regulator to the parking sensor unit.:eek:

I would like to know, is there any other voltage points that I can take low voltage instead.:roll:


Thanks in advance
 

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Welcome to Saab central.
I hard wired my radar detector and fished the wire through the rear-view mirror hole in the headliner, nice clean install if I do say, Anywho I picked up power for the detector (wich hardly draws anything) from the dash lighting circuit, wich is hot when the ign. switch is in the run position.
 

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You won't need a regulator but 500mA is nothing so anywhere convenient that you can find battery voltage with the ignition on will be fine. The radio supply is as good as anywhere.
 

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Laymans version of Ohms law

:lol: Just for clarity ,

You are not looking for a low voltage supply , you are looking for low amperage , that is to power an applianvnce that only draws .5 of amp .

Not trying to be pedantic , just trying to help your understanding .

In theory YOU could run a cable of any gauge ( huge amp capacity ) your appliance will still only draw the amperage you require .

Think of it this way

Voltage = a Quality

Amperage = a Quantity .

EG . your starter may draw say .. 10 amps ? its still 12v , its a heavy cable to allow the QUANTITY

your radio , may draw .2 amps , but small quantity , small cable . Its still 12v tho ...

SO .. in essence any live supply that is controlled from the ignition switch , BUT yeah ... radio or dash lights are both good , the light on the ashtray is one of the easiest points you will find :lol:
 

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My highschool drafting teacher explained it like this. "voltage is the size of your army and Amperage is how fast they are runnint" Thanks for bringing this up though as I was thinking of wireing my radar detecter in a similar manner.
 

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AUSSIE900 said:
BUT yeah ... radio or dash lights are both good , the light on the ashtray is one of the easiest points you will find
The ashtray light voltage can be reduced by the rheostat. Use the lighter feed for a switched source in that area.
 
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