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Help w/ measuring R/R voltage drop

  • Thread starter Thread starter seano
  • Start date Start date
S

seano

Guest
Electrical noob here. Going thru the Stator Papers and trying to measure the R/R voltage drop at the negative lead - Step #3. It's telling me to put the red probe to the to the battery negative pole, and the black probe to the black/white R/R wire which in my case is connected to the battery negative pole. Anyway, I get no reading (00) at idle or at 5,000 rpm. Where am I going wrong here?
 
You are doing fine.

It's really hard to measure the drop in a non-existant wire.

Your only other option is to use a pin to stick the black/white wire very close to the R/R, clip one lead there and put the other lead to the battery. That way, you will see if the wire is, indeed, intact.

One problem with doing that is that you have now compromised the integrity of the insulation, and can allow moisture in to corrode the wires. If you do this, cover the hole with Liquid Electrical Tape.

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Hi,

Since you have the r/r grounded to the battery, a more informative test might be checking the voltage drop between the r/r output and the positive battery terminal.

Thank you for your indulgence,

BassCliff
 
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Thanks Steve, I'll do that. So I should get a different reading very close to the r/r vs. at the end of it?
Basscliff, I did measure the voltage drop there. It was 0.08.
 
seano said:
Thanks Steve, I'll do that. So I should get a different reading very close to the r/r vs. at the end of it?
Basscliff, I did measure the voltage drop there. It was 0.08.
Click to expand...

At 5000 RPM 0.08V is a good number. You are primarily trying to measure voltage drops due to poor connections. If the R/R output is connected through a short wire (without connections) directly to the battery then the only votage drops are between the end of the short wire and the (stabbed) center post of the battery. (so you would be measuring the voltage drop across the crimped on connector of the R/R wire and the battery cable end that attaches to the battery post.)

If there is a long wire on the R/R that was connected, then go from the connection side closest to the R/R to the center post.
 
Last edited:
Posplayer,
thanks for your explaination. Although I've read it a few times, I'm kind of frazzled at the moment, so it's not making sense to me right now. I'll try again tomorrow :).

I went forward to test phase "B" of the stator papers. All Three readings between the 3 yellow stator output wires were within spec at 0.9 to 1.0 Ohms. Good!

I got no reading at all (infinite resistance?) when measuring between the 3 yellow stator output wires and the engine case. Good!

Switched multimeter to AC-Voltage and measured output between stator output wires @5,000 rpms and got readings of 87, 91, and 91. Although they are not equal, are they close enough or is the stator shot?
 
seano said:
Switched multimeter to AC-Voltage and measured output between stator output wires @5,000 rpms and got readings of 87, 91, and 91. Although they are not equal, are they close enough or is the stator shot?
Click to expand...
Close enough, and VERY good readings.
icon_thumbsup.gif


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Good deal!! Though the r/r is toast. Think I'm gonna spring for the compufire . . .
 
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