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question
Dodge Dakota
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5/29/2006
16:44:56
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 Subject: Where do these grounds go?
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Hello,
I recently had my 1998 5.2 dakota motor apart and i forgot to label where the grounds go. There are three grounds that come out of the harness on the driver's side near the AC compressor. Two are small and identical, and the third is larger. Are these grounded to the AC bracket bolts? PS unit? Compressor? please help. Also there is one on the passeneger side that I assume is on the bolt holding the oil dipstick, is this right?
Thanks.
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cuzindoug
GenIII
 
5/29/2006
22:24:37
| RE: Where do these grounds go?
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Message:
I can't remember right off hand, but it really doesn't matter where they go...well, as long as you hook them back up to a GOOD ground.
If it doesn't fit, force it. If it breaks....well, it needed to be replaced anyway!!
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Bob Lincoln
Dodge Dakota
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5/30/2006
10:31:52
| RE: Where do these grounds go?
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It absolutely does matter where they go. The big one goes to the block, another to the left fenderwell, and one into the relay box. Without them all, there will be some circuitry whose ground is at a different voltage from another ground, setting up a ground loop, therefore a DC offset that can screw up the computer inputs or your gauges and affect performance.
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question
Dodge Dakota
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5/30/2006
12:25:43
| RE: Where do these grounds go?
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OK, so it matters. Where do the three coming out of the harness near the AC compressor go? Anyone have a picture? They aren't long enough to reach the fenderwells or the relay box...
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cuzindoug
GenIII
5/30/2006
18:46:07
| RE: Where do these grounds go?
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Message:
Bob Lincoln, that's why I said a GOOD ground. You will get more voltage drop from the wire than you will from a GOOD ground connection. That's why I redo the chassis to battery, chassis to motor, and chassis to cab/fender connections with 2/0 AWG cable on all the vehicles I have owned. Equates to about 1 hundred thousands of an ohm per inch. Voltage drop is negligible.
Anyway question, if the lug sizes of all the wires is 5/16 or 3/8 then yes, they attach to the A/C compressor bracket and the ground on the passenger side goes to the dipstick bolt. Make sure you put that ground in the order: Alternator bracket, then ground lug, then dipstick bracket, then bolt.
If it doesn't fit, force it. If it breaks....well, it needed to be replaced anyway!!
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Bob Lincoln
Dodge Dakota
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5/31/2006
08:23:25
| RE: Where do these grounds go?
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"That's why I redo the chassis to battery, chassis to motor, and chassis to cab/fender connections with 2/0 AWG cable on all the vehicles I have owned. Equates to about 1 hundred thousands of an ohm per inch. Voltage drop is negligible."
Yes, the connector will give more resistance than the 20 AWG wire. However, your math is faulty. 20 AWG wire has a resistance of about 12 milliohms per foot, or 1 milliohm per inch (one-thousandth of an ohm). A good connector will yield 50 to 100 milliohms.
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cuzindoug
GenIII
5/31/2006
14:57:40
| RE: Where do these grounds go?
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Message:
Okay, that is correct if you use 20 AWG, but I use 2/0 AWG (00 AWG).
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
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cuzindoug
GenIII
5/31/2006
15:03:57
| RE: Where do these grounds go?
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Yes, my math was off though. 2/0 cable has 6.42 microohms per inch.
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
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cuzindoug
GenIII
5/31/2006
21:02:57
| RE: Where do these grounds go?
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sorry for the bump, trying to get rid of the image.
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
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Wadak
GenIII
6/01/2006
01:22:43
| RE: Where do these grounds go?
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I always add an a couple of additional grounds to the coil, battery and block.
92 and 97 Daks both with many mods.
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Bob Lincoln
Dodge Dakota
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6/02/2006
08:22:47
| RE: Where do these grounds go?
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"Yes, my math was off though. 2/0 cable has 6.42 microohms per inch"
http://www.bnoack.com/index.html?http&&&www.bnoack.com/data/wire-resistance.html
77 microohms per inch - 12 times higher than what you stated.
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cuzindoug
GenIII
6/02/2006
09:44:02
| RE: Where do these grounds go?
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77 milliohms per 1000 feet, 77 microohms per 1 foot, which means 6.4166666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666........ microohms per inch.
I got this directly out of my trusty NEC 2005 handbook.
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
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cuzindoug
GenIII
6/02/2006
09:50:34
| RE: Where do these grounds go?
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Can we stop throwing retorts back-and-forth. We have both shown we are knowledgeable in this subject. I'm and electrician, you sound like a engineer of some sort, so let's just shake our ethereal hands and got on with our lives:)
If it doesn't fit, force it. If it breaks...well...it needed to be replaced anyway.
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