with the key off no voltage will be going to that connector.

For the injectors you dont need to ground if you are doing it from the VC gasket connector 1 pin goes on the center connector and the other on the next two just outside of it.

Practice on a light bulb, 1 pin on the threads and the other on the "dot" on the bottom.

 

Ok, finally something I can contribute to. What you are about to do is call checking Resistance. Everything has resistance to it even a wire. You lose voltage and current over resistance. I'm not sure what he has you checking, but if he has you grounding then you should be checking to see if you have a wire grounded that shouldn't be. There is alot of thing you can tell from resistance, a malfunctioning component, temperature, grounds, shorts, even tracking where circuitry goes. The everything you use every day uses resistance to work. Resistance is measured in Ohm's (via Ohm's Law). If you have any general electrical or electronics questions I can help, as for the specific of the truck alan is the man!

 

By the way you measure resistance by sending voltage through a circuit. The Multimeter you have sends voltage through one end and senses it through the other and measure the loss inbetween the given value Multimeter and the return value and there is your resistance.

 

Thanks Allan, Zwalters, I 'm gonna give it a shot tommorrow morning.

So... When I disconnect the plug at the IDM I will strictly be checking the resistance AT the IDM.

And when...... I pull the plug at the valve cover(leaving the valve covers on) I am checking the resistance through the 42 pin connector.

Fineally.....So how do I OHM the wiring harness underneath the valve cover if I have the connector disconnected on the outside and there is no juice running to anything under the valve cover.

 

 

The voltmeter has the juice when your checking resistance. It is bad to check resistance with power applied. One simple way to see how this works is take your two leads and switch the mulitmeter to a 10 ohm setting or if it is digital(No dial) it does this for you, you just have to select to measure resistance(Ohms). It should read close to zero. Now go and touch something like the alternator (just the outside of it) and another ground point alittle ways away from it. That is the resistance between those two points, the amount of "Resistance" it took electricity to get from point A to point B. That is what you are looking for. The closer it is to zero the less resistance you have, and that works both ways. If there is no way for the electicity to get back you your other lead this is called infinity which basically means there is no way for electricity to get from point A to point B. Now if there is no way for electicity to get from point A to point B then there is a break in your circuit. Some circuit are supposed to have breaks in them, (IE switches and relays, ect.) This process is similar to pressurizing your garden hose and one end, and seeing if water comes out on the other. If there is a slight kink in the line and water flow is lower than you know it should be, that's like resistance. If you have no water coming out what so ever, what does that tell you. Either something is blocking it (like a valve) or it is disconnected somewhere in the middle. This is the equivalent of infinite resistance. Questions?

 

Dood , I got it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WooHoo

This multi meter actualy sensesthe resistance becuase it snds a signal through the sytem. That is awesome!!!!!!!!!!!!!!!!WooHoo So thats how you see whats goin on inside that valve cover!!!!!!!!

Now I have to go to the light bulb forum and let them know that the resistance on this lightbulb i got here is about 24 ohms. This is awesome!!!!!!!!!!!!!!!!

Thankyou
Will post my results tommorow

I have a continuity feature that is inside this multimeter and the instructions state that I can test resistance using it. Should I use it or stick with the regular OHM's reading?

 

Ask alan, I don't know if you are looking for a open circuit or a specific resistance. Continuity is basically either yes the wire can pass electicity or no it has a infinite or high resistance. I would use the ohm setting just to see if you have any particular high resistance through that wire, sometime you can have continuity and still be out of specifications for the computer to read it. Like I said, ask Alan.

 

And BTW, if you want to know anything at all about electricity or circuits, computer circuitry or any electrical general info just ask, that's what I do for a living.

 

Are you ohming out injectors? If so what is the resistance supposed to read for injectors?

 

Thanks Zwalters, basically in the continuity setting, the instructions state that If it OHMs under 30 it will beep. Then give you an actuall reading. I guess I will just stick with the OHM measurement for now. Thanks again guys, I have to find something else to OHM ASAP. Think I'm gonna OHM the wife. She's had a miss for a while now.

 

Hey John, Amiller sent me a post for the Ohm reading. It should be <5 for the injectors.

 

Z - ford specs a resistance for the injectors and glow plugs, it an easy way of testing them, injectors should be below 5 ohms and glow plugs should be between 01. and 2 ohms. testing through the harness is just easier than opening the VC's every time and the "loss" in that short distance in minimal.

 

You can ohm your wife, just be careful not to break skin and be anywhere near the heart. I know of a guy who did it for a joke and apparently poked his nipples(pierce or something) and ended up inducing a heart attack at 25. He lived but he doesn't mess with them anymore. I can't be 100% sure if this was true but it takes less that 10 milliamps to kill you. that is .01 amps.

 

I'll skip the wife then, that would be a hard one to explain. Can i test the batts with this puppy? A/C right?