EVERYONE with a V6 please Read (Page 21/39)
mize FEB 09, 12:11 AM
I just measured 30 - 34 ohms from the negative battery terminal to the block. Do you guys think it would make a difference to add a ground strap to try to reduce the resistance further? Or is ~30 ohms OK?
$Rich$ FEB 09, 12:17 AM

quote
Originally posted by FierosinKY:

Has anybody tried this on an iron duke?

Mike


should work,, give it a try

$Rich$ FEB 09, 12:20 AM

quote
Originally posted by mize:

I just measured 30 - 34 ohms from the negative battery terminal to the block. Do you guys think it would make a difference to add a ground strap to try to reduce the resistance further? Or is ~30 ohms OK?



give it a try its literly under a $5 mod, and may be verry well worth it, and should only take up 10min worth of your time

HI-TECH FEB 09, 04:50 AM
gotta remember everywone..electricity flows from negitive to positive not positive to negitive...the more the ground the better, even if your a radio nut like me
2birds FEB 09, 06:50 AM
Kirchoff's Current Law

Essentially, the sum of the currents entering a node (component) equals the sum of the currents leaving a node.

So, as far as power handling capability, your positive side should be the same as your negative side, since the current flow is equal both going into and leaving the component, whether you use whole flow or electron flow as your way of making sense of electricity.

Pyrthian FEB 09, 01:34 PM

quote
Originally posted by mize:

I just measured 30 - 34 ohms from the negative battery terminal to the block. Do you guys think it would make a difference to add a ground strap to try to reduce the resistance further? Or is ~30 ohms OK?


I normally check this in volts, not ohms - gives a better idea what you are losing - ohms is kinda vague for most people. yes, you will see a voltage. thats the voltage that is NOT making it to your starter, headlights, window motors, etc.

mize FEB 10, 07:25 AM

quote
Originally posted by Pyrthian:


I normally check this in volts, not ohms - gives a better idea what you are losing - ohms is kinda vague for most people. yes, you will see a voltage. thats the voltage that is NOT making it to your starter, headlights, window motors, etc.


So you're saying to measure it while the engine is running? All I was doing was checking static resistance between the block and the negative battery terminal. The resistance is what we're trying to fix. If you measure voltage, couldn't that indicate other things than just a bad ground?

Pyrthian FEB 10, 08:46 AM

quote
Originally posted by mize:
So you're saying to measure it while the engine is running? All I was doing was checking static resistance between the block and the negative battery terminal. The resistance is what we're trying to fix. If you measure voltage, couldn't that indicate other things than just a bad ground?


running, not running, while starting - all three will give you idea on how bad your ground is.
no, it tell you only the voltage drop caused by the resistance in the battery to block connectoin - ie ground
Dodgerunner FEB 10, 09:07 AM
Also the resistance will change depending on the load thru the connection.
IE when you measure the resistance you are measuring it static or kind of under idea conditions.

When you measure the voltage difference from the engine to the batt. your measuring under real conditions.

With high current flows the resistance will change as connections heat up from the current possibly making a big change in the resistance. The only way you can measure the real resistance is by knowing the actual current flowing and dividing that into the voltage drop. Since you can't easily measure the current (at least not when starting) any voltage drop is a bad thing.

Just to give an example. Let's say the cable and connections from the batt. to the starter have only .02 ohms of resistance. That does not sound like much right! Now you start your engine, what do your think it might pull for current 50 amps sound reasonable? .02 X 50 = 1 volt lost. So your starter is already down to 11 volts. If you have ever had a dirty batt. connection and touched it after you have started the car they can get really hot.

Bottom line. If you are measuring a voltage drop, correct the problem however you can....

mize FEB 12, 01:12 PM
Well, I stuck to using the static resistance using a DVOM between a couple of points on the engine and the negative battery terminal. I added two ground straps and (for comparison sake) now measure ~.01 ohms. The idle is better...still hunts a small amount, but that may be due to the ECM getting reset.

I am happy I did this simple "mod". Now I have to figure out why my tach always reads 200 RPM higher than the ALDL output says.

Steve