Question about 1994 Dodge Ram

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All i wanted to know is that the coil, alternator supposed to be hot all the time or just when the key is turned on? and where is the automatic relay sensor(switch thing) is located at?

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You're looking for the Auto Shutdown Relay. Should be in the Power Distribution Center under the hood. It will power up the fuel injectors, coil, and fuel pump for 3 seconds when you turn the key on, or when the vehicle is being started or running.

Posted on Jun 27, 2009


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Relay seems to be getting power ( it's clicking) there is NO FUSE OR FUSABLE LINK. Wire straight from relay has no power. Add power to it and still get none from the other end.

A couple of things: Relays have a power side, and a coil side which signals the relay on. Your coil side is working, hence the click, which should close contacts on the power side, and send power out from the relay.

Just possible your relay is bad on the power side. Swap it with another relay to check. The exact same relay may have other applications on your car. If the relay's part numbers match, it is the same relay.

The other possibility is the power feed for the relay may have been lost. Usually the power side, the power feed terminal, is hot at all times- battery voltage available at the relay-just waiting to be sent to do work. And if it is "hot at all times", that means the power feed is fed from a maxifuse or a fusible link. Power from the battery would not be sent there without a fuse or fuse link for protection.

If you have a test light or voltmeter, try this: pull the relay out, key off, and probe all 4 or 5 terminals of the relay plug terminals. If "hot at all times", one terminal should show power on it. If it is a hot at all times terminal, your relay is definitely bad if you find power there. Now some circuits with a relay, like some starter relays, do not have a hot at all times power feed- only when key is on, or when relay is signaled, does the power feed show up. To check this, turn the key to on, or to start if a starter relay, and now check all relay terminals with the test light. This time you should show two hot terminals- the power side feed and the coil side (the relay signal side) should both have power on them. If you only see the coil side power that made the click, then you have to check the wiring to that relay. Good luck.

Jun 16, 2015 | Cars & Trucks

1 Answer

No power to coil with ignition on. Power at pin 30 all the time and pin 86 with ign on. negative at pin 87. 12v at pin 85.turn key on power at coil for 2 sec. Power at cavity 3 at comp. Fuel pump ok. Code...

Mike, I don't know what you are working on, Chrysler? Chevy? Chrysler and Jeep have an Automatic Shutdown Relay for power to the coil. But the only thing I know that gets a 2 second signal with key in on, is the fuel pump relay. The pcm sends a 2 second signal to pin 85 or 86 of the FP relay with key on to prime the fuel system. Do you need a wiring diagram?

Mar 16, 2015 | Cars & Trucks

1 Answer

I want to know how to wire esuse day lights to a mazda cx 5 2014 model

You will need a relay, capable of handling 10A, a breaker (or fuse) that is also 10A, and some automotive power wire of at least 14 awg.
Run a wire from the positive (+) side of your battery (at the starter solenoid if you can access it), to one side of the breaker, and run the other side of the breaker to the primary side of the relay. Shelter all exposed terminals from contacting the chassis. The relay output wires directly to the positive side of the daytime running lights (with the - side of the daytime running lights to chassis for ground), one side of the relay coil to any ignition-switched power source (solenoid ignition connection will work), and the other side of the relay coil goes to chassis ground.
The daytime running lights will automatically turn on when you turn your ignition key on, and will turn off when you turn the key. Using this relay arrangement helps isolate them from other circuits, which they may otherwise overload.

Jul 25, 2014 | Cars & Trucks

1 Answer

Difficult to start (hear noise) turn the key few times and starts

- For starting problem check the following:
- Battery (perform battery test with battery tester).
- Check battery terminals for any corrosion and sulfate deposits.
- Battery to starter motor cable.
- Battery to engine ground and chassis cable.
- Starter relay and solenoid.
- Starter motor.
- Ignition switch.
- Wiring and connectors.
- Alternator.

Mar 02, 2014 | Cars & Trucks

1 Answer

No want to start,no light check engine on,

Maybe I can give a little help. Do you have the 4.0 liter straight six engine? This should apply as well if you have the V8 engine. check engine light...:With key on, does the light turn on? If not, it may not be getting power. Have to check that first, check all fuses in the under hood relay/fuse block. The check engine light should turn on with key in on position, just as an alert that the PCM is powered, and ready to work.

" electric to coil..." With key on, the dark green/black wire to the coil should have battery voltage. In that fuse/relay block will be a relay called an Automatic Shut Down relay (ASD relay). When the PCM turns this relay on, power is sent to the ignition coil on the green/black wire. The power feed for the ASD relay is fuse 2, a 20 amp fuse in the Power Distribution Center -the fuse/relay block under the hood.

So you have a couple of things to check: Make sure the PCM is powered. If it is, hold your finger lightly on the ASD relay while someone turns the key to on. You should feel it click on. If it does, but no power at the coil, check if fuse 2 is sending power to the relay, and check the green/black wire from relay to coil. If no relay action, possibly a bad relay, or the PCM is not turning the relay on.
Good luck. Let me know what you find.

Jan 04, 2014 | 1995 Jeep Grand Cherokee

2 Answers

Escort won't start when cold and has the strangest solution...

no, not likely. And a dry hose is a good sign, but a hose wet with gas is a sure sign of a failed pressure regulator. Your problem may be the pump not priming the fuel system. Here's how it is supposed to work: when you turn the key to on, computer will signal the fuel pump relay to turn on for about two seconds, and without a cranking signal from the engine, computer will then turn the pump off. When key is turned to crank, the computer will then turn pump back on-when engine is cranking or running, the pump is on continuously. But just turning the key to on, you should hear the pump run for about two seconds, and that will pressurize the fuel system.
At those times when it doesn't want to start, you should test the fuel pressure to see if the fuel rail is pressurized. If no pressure or low pressure, diagnose the wiring at the fuel pump relay. The relay is very simple- 4 prongs, 2 on the power side, and 2 on the coil side. The power side has a hot at all times wire and then the wire going to the pump. The coil side of the relay has a wire from the engine computer, and the other coil side wire is a ground. When the coil side is energtized by the wire from the computer, the relay is switched on and will pass power from the hot wire to the pump. So if the pump doesn't come on briefly to prime the system, the computer may not be signalling the relay, or there is a wiring problem around the relay. Good luck. You might just try a different relay-maybe yours is sticky and not responding.

Oct 29, 2012 | Cars & Trucks

1 Answer

No hot wire to the coil 1997 Plymouth Voyager 3.3

Does the check engine light come on whe you turn the key to ON? It should come on, just as a little alert to you that the pcm is powered, and then go off once the engine is running. I'm not certain, but I believe on your car that the coil signal comes direct from the pcm, the engine computer. Check all the fuses in the power distribution center, especially a pcm fuse if you have one there. The Automatic Shut Down relay (ASD relay) is also there in the box. This relay cuts power to the coil and to the injectors when key is turned to off. Maybe something is going on there, you might try a different relay just to check. I think the A/C relay may be the same as the ASD relay, check the numbers on the relays. One shoulde be swappable with the ASD relay.
Good luck, I don't know what else to suggest. It would help you to find a wiring diagram just to check the engine ignition aqnd starting circuit, see how the coil gets its signal. Car repair manuals do have wiring diagrams.

Jul 06, 2012 | 1997 Plymouth Voyager

1 Answer


doe's it crank over when you turn the key but doe's not start. it might be the coil pack. the coil pack is where the spark plugs plug into. if it gets hot your truck wont start till it cools down than this is the problem.

Dec 14, 2009 | 1998 Mazda Pickup

1 Answer

Trailer connection not working need to know which fuse to change 2005 Ford F150 Lariat

Trailer Tow reversing relay ( non serviceable ) and the Trailer tow parking lamp relay are both fed from Fuse #10 ( coil on reversing relay is fed from reverse lamps & coil on parking lamp relay is fed from the parking lamps ).

Trailer Tow battery charge relay is fed from Fuse #106 ( coil is fed by fuse #13, hot in start / run position from key ).

Right Stop / Turn is fed from Fuse #36 ( powered from MFS circuit for truck stop/turn )
Left Stop / Turn is fed from Fuse #42 ( powered from MFS circuit for truck stop/turn )

Parking lamp is

Oct 17, 2009 | 2005 Ford F-150

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