commsirac
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The Gregory's manual gives some very high tolerances there! I would discard any lead that offered more than 15kOhm per metre. New leads will all read well under this. The ICE leads I have on my vx only have about 3kOhm per meter. Its always good to actually measure the resistance of your new leads before you stick them on.......then when you remeasure down the trackyou will know if they have deteriorated or not. If the resistance has changed a lot, thats a sure sign they need changing, whether they are within tolerances or not.
Testing with the multimeter will tell you if the core has broken down, but that is only half the story. Faults in the insulation can be just as problematic, though not as common, and in combination with a weak core can be even more problematic with cross fires........read backfires on lpg systems.
Testing the insulation is trickier(its a bit beyond the multimeter resistance readings)......it really involves detailed visual inspection looking for any cracks in the insulation(generally if there are no cracks the insulation integrity remains good). Other than that the only way to test is to apply high voltage to the lead and run an earth conductor over the lead to see if a spark jumps.....ouch! Also observing the system in the dark may detect any small discharges from cracks. Both the core and the insulation both deteriorate from heat, so look more closely at the plug ends when you are checking for discharge.
Testing with the multimeter will tell you if the core has broken down, but that is only half the story. Faults in the insulation can be just as problematic, though not as common, and in combination with a weak core can be even more problematic with cross fires........read backfires on lpg systems.
Testing the insulation is trickier(its a bit beyond the multimeter resistance readings)......it really involves detailed visual inspection looking for any cracks in the insulation(generally if there are no cracks the insulation integrity remains good). Other than that the only way to test is to apply high voltage to the lead and run an earth conductor over the lead to see if a spark jumps.....ouch! Also observing the system in the dark may detect any small discharges from cracks. Both the core and the insulation both deteriorate from heat, so look more closely at the plug ends when you are checking for discharge.
