Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: pauls on 24 May 2016, 14:49:14
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I have got hold of a second hand wiring loom. Before fitting this is it possible to check each wire/plug doesnt have a break in it, can I do this with a multimeter. I have visually checked them but would like to test it fully.
Being that i dont have a clue with this if its possible could you explain in simple terms e,g what do i set the dial on the multimeter and where do i place the red and black leads.
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On your multi metre there will be a setting that looks like a speaker. Normally next the the lowest ac volt setting. With this your 2 test cables should make a beeping noise when put together. You can now test each end of the cable to see if you get an audible beeb.
This will take a while to do so good luck.
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On your multi metre there will be a setting that looks like a speaker. Normally next the the lowest ac volt setting. With this your 2 test cables should make a beeping noise when put together. You can now test each end of the cable to see if you get an audible beeb.
This will take a while to do so good luck.
Its a Diode symbol actually, for checking Diodes and Transistors, advantage being it will bleep at you when the propes are shorted together saving you the trouble of looking at the display when checking continuity tests. :y
If your DVM doesn't have one then use the Impedance / Resistance check, normally marked as a Greek Omega symbol, a short cct will show zero Ohms. ;)
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On your multi metre there will be a setting that looks like a speaker. Normally next the the lowest ac volt setting. With this your 2 test cables should make a beeping noise when put together. You can now test each end of the cable to see if you get an audible beeb.
This will take a while to do so good luck.
Its a Diode symbol actually, for checking Diodes and Transistors, advantage being it will bleep at you when the propes are shorted together saving you the trouble of looking at the display when checking continuity tests. :y
If your DVM doesn't have one then use the Impedance / Resistance check, normally marked as a Greek Omega symbol, a short cct will show zero Ohms. ;)
I'd add that when testing continuity in a loom it's worth wiggling connectors etc as there may be a fracture that only presents itself under certain circumstances such as vibration.
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I have the factory wiring diagram here, will take alot of the guess work out of which wire connects to which pin at the ecu to what plug at the other end... iirc, there's potentially 90 ish pins on the ecu plug, and some of the wires have more than one output... ;)
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It's only really practical to test for breaks in the wires - open circuits. To check for shorts between wires is much more complicated because you have to check for continuity between every wire and every other wire (looking for shorts that shouldn't be there). The number of permutations rapidly becomes enormous in a loom with more than a dozen or so wires in it.
So usually, you just plug it in and see where the smoke comes from or which fuse blows ;D