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Where can I find a 12V source in the engine compartment that is only on when the ignition is switched on?

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You can tap into the power side of the coil this is ignition power. Not knowing the model year of your car this is the best i can do for ya. Please rate this answer This will help me thankyou.

Posted on May 30, 2010


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Do you think the sound originates within the passenger compartment or possibly from within the engine compartment? There is not much that might knock inside the car . If it knocks every time you switch off I would suspect the engine compartment and a mechanical cause.
Might be something a loose component, maybe the exhaust hitting something as the slowing engine vibration causing a harmonic at a certain point. Possibly, but unlikely, an engine mounting.
Have somebody assist you to trace the source of the sound, it is hard to do alone.
There used to be an Audi advert in which a sound could not be traced and it took an expert to track it down. (He had to oil the pendants on the woman driver's earings!)

Oct 28, 2015 | Cars & Trucks

1 Answer

Needles on dash guages (temp,fuel,speed) chatter or vibrate on their lower limit pins when the ignition switch is turned on or the engine is started. After about 30 seconds the needles move to their normal...

Disconnecting the leads from the solenoid,avtivating the switch, and reading 12V is normal because you are not reading anything but the signal applied to the solenoid.You need to attach the leads and THEN activate the switch and read the voltage across the terminals.12V would mean the solenoid is good because a voltage reading is a DIFFERENCE of electrical potential.If you have the leads attached and read 0V,there is no difference of electrical potential meaning there is actually 12V on both sides and the solenoid is not absorbing/using the power like it should be.If you simply read the 2 terminals on your battery it would read 12V,likely higher because a good battery will usually read close to 13V.A bad battery may read as high as 11.8V.As for the guages,it may also be that the battery is low if it has never been changed.The average life of an alkaline car battery is about 6 years.If yours was made and sold in 2000 like they like to do these days,the battery may have been changed once and is starting to be borderline.With the car off,no keys,nothing,read across your battery terminals and please let me know what you find. gmccarthy 86 hotmail

Feb 22, 2011 | 2001 Kia Optima

1 Answer

Brake lights don't light, bulbs good, flashers and turn signals ok, tail lights good, swapped bulbs and 20a fuse in engine compartment

Hello compwizard
The next thing to check is the brake light switch. The switch is located
under the dash on the left side of the brake peddle bracket. There
should be constant 12v into the switch and 12v out when brake is
applied. Use a 12v test light or volt meter to check the switch. The switch is a fairly common cause of the problem you have.
Hope this helps

Jul 18, 2010 | 2000 Plymouth Grand Voyager

1 Answer

Wiring diagram

Sorry, don't have a diagram; but:-
The +12V supply end goes to an "+12V when Ignition on" source.
Note that the positive side of the coil also connects to "+12V when Start" source, to ensure maximum supply voltage to coil while cranking engine.

Sep 13, 2009 | 1994 Dodge Colt

1 Answer

Engine compartment got wet now it is missing and

Let a fan blow in the engine compartment for a long while. More importantly, the ignition wiring and plugs need to be dried out. Trace spark plug wires back to their source.Use WD 40 or a wire dry spray (auto parts store). Unplug spark plug wires and spray. Unplug ignition module wires and spray. Unplug all electrical plugs and spray. Also use a air dryer to remove moisture, and to dry out wires.

Jul 18, 2009 | 2002 Toyota Tacoma

1 Answer

Where is the ignition power source under hood in 94 chevy 1500?

The coil, one is a constant 12v source, the other is a remote ignition source.

Apr 28, 2009 | 1994 Chevrolet S-10

1 Answer

No Power to Fuel pump

I would check the ground for the fuel pump relay that operates the switch side of the relay.
You should have 2 12v inputs to the relay. When the relay gets 12v input, it closes the relay switch on the heavy current side that sends 12v to the fuel pump.

A relay is needed because you don't want heavy current going through the switch.

Also, most cars only run the fuel pump for 2 seconds when the key is turned on because you don't want the fuel pump running without the car running. If you listen closely at the fuel tank, you should hear the pump run for 2 seconds when you turn the key to "ON"
When the key is turned to "START", the fuel pump should run continuously.
The engine computer tells the fuel pump to shut off if the engine rpms are zero.
So, I would check the switch side of the relay. Power amd ground.

Mar 01, 2009 | 1992 Jaguar XJ6

1 Answer

96 Dodge Diesel, ignition switch

Inside engine compartment, look for injection pump, on side or top you will find an electrical connection, that connection comes from Your Key, it is an on and off electric valve, if You bring 12V power strait from the battery and clip it to that valve, go and try starting car, if car runs, after Your key or a Relay, my be defective, look for oil and coolant level, and Diesel Filer

Jan 25, 2009 | 1996 Dodge Ram

1 Answer


Yeah have the voltage to the compressor checked!..By turning on the A/C when hot (and not working),Add a test wire to the 12v output of the A/C relay, to "boost" the 12v amps/voltage going to the compressor clutch. As soon as the test wire touches a strong 12v source, the clutch immediately kicks in. Remember that 12v already existed on that wire, but a stronger 12v source helped give the clutch the extra kick it needs. Thank you!!..Hope this helps you out buddy!!.. :)

Jul 19, 2008 | 1993 Nissan 240SX

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