Ford's position on adding a ground from the body to the transmission - Page 4 - Ford Powerstroke Diesel Forum
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post #31 of 55 Old 11-07-2019, 08:00 AM
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Every wire, every connection has resistance. You can't get around science.

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post #32 of 55 Old 11-07-2019, 09:01 AM
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Quote:
Originally Posted by TooManyToys View Post
Every wire, every connection has resistance. You can't get around science.
Yes but it's a very low resistance, it isn't relevant to the conversation.

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post #33 of 55 Old 11-07-2019, 10:08 AM
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It is relevant. There's still current flow, there's still the same voltage potential between the two parallel circuits. It's high school electricity.

This is a tough crowd. You want relevancy, let's go back to my earlier post. There's no conductivity between the trans, transfer case, driveshafts, axles, springs, shocks, ball joints or tie rods to the frame and it's connected body tub. If you add a cable, you are providing a pathway through the trans. I'm in a unique position to show that without the engine as the conduit there's no connection.



Edit - Bill has his head up his .......
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post #34 of 55 Old 11-07-2019, 11:22 AM Thread Starter
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Very well said Jack. Thanks for contributing, but sorry for dragging you into such an emotional topic. Hard to understand why IMO.

Quote:
Originally Posted by TooManyToys View Post
So the bodybuilder adds a grounding cable to the frame because the block to frame straps were not sufficient enough. Adding a cable from the frame to the transmission then does the same thing afterward if not addressing the block to frame!

Ford actually says to not add a grounding strap to the transmission, but also says if the loads are high to connect a strap directly from the alternator to the frame, not going through the block and certainly not going through the transmission case.
Your post above is spot on. One has to think beyond the recommendation and get to the "why" of the recommendation.

Adding a second body unit ground to the frame when/if the existing (as designed) frame-to-block strap is an insufficient pathway just doesn't "add-up". The alternator to frame ground makes a lot of sense. IMO, so does adding another frame to block ground. Checking the condition of the existing ground wires and straps is clearly very wise (at least we can all agree on that one).

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Last edited by bismic; 11-07-2019 at 12:25 PM.
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post #35 of 55 Old 11-07-2019, 11:42 AM
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Well, you know how I get during debating a subject ......

It ain't personal, I was an only child.
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post #36 of 55 Old 11-07-2019, 12:16 PM
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Who knew you boys were so passionate about grounds.
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So says the internet... ...and so it shall be.
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OK, thanks for the info. To show my ignorance, what is the problem with 3 nipples...

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post #37 of 55 Old 11-07-2019, 12:57 PM
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Those who have done three videos on the subject with a fourth coming.....
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post #38 of 55 Old 11-07-2019, 01:36 PM
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Quote:
Originally Posted by TooManyToys View Post
It is relevant. There's still current flow, there's still the same voltage potential between the two parallel circuits. It's high school electricity.

This is a tough crowd. You want relevancy, let's go back to my earlier post. There's no conductivity between the trans, transfer case, driveshafts, axles, springs, shocks, ball joints or tie rods to the frame and it's connected body tub. If you add a cable, you are providing a pathway through the trans. I'm in a unique position to show that without the engine as the conduit there's no connection.



Edit - Bill has his head up his .......
Referring to the first diagram on your attachment 1-4 is on the positive side of the load and 5-8 is on the negative. If you put one lead of a volt meter at 1,2,3 or 4 and the other lead on 5-8 your going to read 9 volts. If you test between 7 and 8 as long as the wire and connection is good you are going to read 0 volts or very close to 0, not a significant amount. If you wire a resistor in parallel between 7 and 8 and test across that resistor you are still going to get 0 volts across that resistor, because over 99% of the current will still be flowing directly from 7 to 8 (the path of least resistance) and not the resistor that's connected in parallel with it, yes a small amount of current will be going through that resistor, but not a significant amount. However if you cut the wire between 7 and 8 then current will start flowing through that resistor and you will get a voltage reading across it since it will now be in series with the other resistors. You can also test it by measuring amps on the wire going between 7 and 8. You put a resistor in parallel the amps aren't going to change a significant amount, and the amps going through the resistor will be close to 0, cut the wire between 7 and 8 then all the current will start going through that resistor and you will get an amp reading.

When an engine and transmission are bolted together, grounding the engine and grounding the transmission are doing the same thing since there is direct continuity between the two. If you are still able to test it I would like to see what happens when you test for resistance between the torque converter and the frame of the truck.
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post #39 of 55 Old 11-07-2019, 03:14 PM
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post #40 of 55 Old 11-07-2019, 05:27 PM Thread Starter
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Quote:
Originally Posted by 00t444e View Post
The point of grounding the transmission and engine to the frame is so the electric will flow through the ground straps and not the transmission itself.
I still would still like to know where this supposed electricity flow through the transmission originates from (I won't argue that a slight potential exists IF you have a short in the transmission's internal harness - but I think it is a very low potential). You must have a (+) connection for electricity to flow to the (-) connection. Jack is showing that there is no connectivity between the frame, or the driveshaft for that matter, to the transmission.

All (+) electrical supply to the transmission controls has the circuit completed through the harness ground wires to the PCM, not through a transmission case ground (pages 29-1, 2, and 3 of Wiring Diagram Manual).

You can't have it both ways. Electricity is either intended to flow (return) through the transmission or it isn't. Clearly I am in the camp that it isn't intended to flow through the transmission (as are most of the people posting in this thread I assume).

With no practical source of a (+) connection, adding a ground strap (frame to the transmission body) will only increase the likelihood of some electrical flow through the transmission ... ESPECIALLY if the vehicle frame to block grounding is in bad shape.

It seems clear to me that this is why Ford doesn't want a second body unit grounded to the transmission, AND that is also why they didn't provide a ground between the transmission and frame from the factory.

Mark
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Last edited by bismic; 11-13-2019 at 07:02 PM.
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