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Do-It-Yourself (DIY) Question & Answer Forum
Car Electrics: If there is a PD of +12V, shouldn't it trigger a relay
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<blockquote data-quote="Doc Hudson" data-source="post: 459057" data-attributes="member: 1607"><p>The only observation I would make is don't assume all car electrical controls are putting a +12v onto a load to energise it to work. There may be occasions where something is controlled in 'reverse' i.e. putting a 0V (-ve earth) potential onto a circuit with +12v already sitting on one side. I know our car washer bottle motor uses a reverse polarity to operate either the front washer jet or rear washer jet.</p><p></p><p>Doc H.</p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 459057, member: 1607"] The only observation I would make is don't assume all car electrical controls are putting a +12v onto a load to energise it to work. There may be occasions where something is controlled in 'reverse' i.e. putting a 0V (-ve earth) potential onto a circuit with +12v already sitting on one side. I know our car washer bottle motor uses a reverse polarity to operate either the front washer jet or rear washer jet. Doc H. [/QUOTE]
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Car Electrics: If there is a PD of +12V, shouldn't it trigger a relay
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