Sean, Richard, and any other electicians
05-16-2003 | 11:37 AM
#1
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From: Lastweek Lane - Watertown, NY
Car Info: 02WRXpseudoSTiWannabeWagon
Sean, Richard, and any other electicians
Dom, you're an electrician, too, right?
Anyhow, here's how I'm coming with the troubleshooting for my WBO2.
How do I do this?
Anyhow, here's how I'm coming with the troubleshooting for my WBO2.
Originally posted by a bad mother****er. Ok, no it's just me, gpatmac
Tried testing the heater circuit again last night. 10volts w/ car off and on. It did get up to about 11 on my last try, though. Can't get it to see my target of 13-13.5 volts
I tested my battery directly, 13 volts.
Could my inline 10amp fuse be suspect?
Tried testing the heater circuit again last night. 10volts w/ car off and on. It did get up to about 11 on my last try, though. Can't get it to see my target of 13-13.5 volts
I tested my battery directly, 13 volts.
Could my inline 10amp fuse be suspect?
For what ever reason it sounds like you have a high resistance in the supply line. Either its too small of a wire gauge for the current demand and length you have or there is a bad connection somewhere inside the length of the lead.
Measure the overall resistance of the line if you can.
You could also measure the voltage drop across your inline fuse holder. It should be essentially zero. If in doubt get some straight pins and stick them through the wire insulation a couple inches from the fuse on both sides and measure the voltage drop under load, or the resistance. That will show the resistance of the entire assembly as installed.
The other quick test is to run a large gauge jumper wire from the battery to the wide band and bypass the original power lead. If your voltages suddenly improve you know you have a power lead problem.
Or a quick binary search test of the line. Measure the voltage from the battery to the mid point of the line. The measure the voltage from the mid point of the line to ground. If one of the readings is noticably lower that the other, you know which half of the line has the high resistance. Do the same test on that segment and in 3 -4 tests max you'll know with in inches of where the high resistance is if it is a single point of failure like a bad connection or crimped/broken wire.
If the voltage drop is due to an under sized wire gauge for the length and current draw then you will see about half the total voltage drop in each half. Since your losing about 3 V on the length of the line, I would expect to see about 1.5 V on each half of the line if it is just too small.
Measure the overall resistance of the line if you can.
You could also measure the voltage drop across your inline fuse holder. It should be essentially zero. If in doubt get some straight pins and stick them through the wire insulation a couple inches from the fuse on both sides and measure the voltage drop under load, or the resistance. That will show the resistance of the entire assembly as installed.
The other quick test is to run a large gauge jumper wire from the battery to the wide band and bypass the original power lead. If your voltages suddenly improve you know you have a power lead problem.
Or a quick binary search test of the line. Measure the voltage from the battery to the mid point of the line. The measure the voltage from the mid point of the line to ground. If one of the readings is noticably lower that the other, you know which half of the line has the high resistance. Do the same test on that segment and in 3 -4 tests max you'll know with in inches of where the high resistance is if it is a single point of failure like a bad connection or crimped/broken wire.
If the voltage drop is due to an under sized wire gauge for the length and current draw then you will see about half the total voltage drop in each half. Since your losing about 3 V on the length of the line, I would expect to see about 1.5 V on each half of the line if it is just too small.
05-16-2003 | 11:56 AM
#3
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Posts: 10,133
From: Lastweek Lane - Watertown, NY
Car Info: 02WRXpseudoSTiWannabeWagon
Here's why I don't post outside of the HIIC for technical stuff.
O replies in the in the last week or so.
https://www.i-club.com/forums/showth...threadid=18690
O replies in the in the last week or so.
https://www.i-club.com/forums/showth...threadid=18690
05-16-2003 | 03:47 PM
#5
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Joined: Nov 2002
Posts: 713
From: Aiea, HI
Car Info: 02 RS
Originally posted by gpatmac
When he's talking about measuring resistance, is that the 'ohms' setting?
When he's talking about measuring resistance, is that the 'ohms' setting?
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