Distributor Lead

[paulh 0]

Trying to trace a slight misfire so decided to check some of the wiring out. Removed the small lead on the side of the distributor as shown below.

 

 

Measuring resistance of the cores (there are 2) between the yellow plug and the black socket -

one reads zero ohms and the other reads about 92K ohms.

 

Can anyone confirm these are correct - perhaps there is a built in resistor on one of the cores

or my lead is knackered.

 

Many thanks in advance.

[Richie-Van-GTi 71 2 Cars]

zero ohms sounds like either the wire is broken inside or you didnt get a connection. You should get something. But may also be your problem as it may be arcing across the gap when running.

[paulh 0]

Yes the zero ohms means there is no break in the wire, the higher reading 92K ohms means a higher resistance which may be the problem I'm looking for.

I decided to measure this to see if the wire was broken or the yellow plug was faulty. Thanks again.

[Richie-Van-GTi 71 2 Cars]

just been and measured mine as Im rewiring at moment anway, I get .7 ohms on both wires. absolute zero normally suggests no connection but I know some meters will read 1 at the wrong end of the display for no connection. All wires have some resistance.

[paulh 0]

Thanks Richie looks like the problem, sounds like a trip to the scrappy at the weekend - Cheers

[Rob_the_Sparky 9]

No connection (open circuit) will not read zero on any meter that I've used and no decent meter will every read absolute zero due to contact resistance and limitations of the meter.

 

However, on the subject in hand - yes it is knackered...

[brianthemagical 1]

it can depend on the range setting/sensitivity of the meter. i.e. if the same range was used for the 92k reading and the 0 reading then the 0 may have meant something like less than 10 or 100 ohms. if it's auto ranging then the above obviously doesn't apply.

i agree with the knackered diagnosis

Edited February 22, 2007 by brianthemagical

[paulh 0]

it can depend on the range setting/sensitivity of the meter. i.e. if the same range was used for the 92k reading and the 0 reading then the 0 may have meant something like less than 10 or 100 ohms. if it's auto ranging then the above obviously doesn't apply.

i agree with the knackered diagnosis

 

It was an auto ranging Fluke testmeter we use at work with some decent test leads.

When I said zero ohms it was probably about 0.2 ohms which is the slight resistance of

the wire and the test leads added together.

[Pugnut 9 1 Cars]

just been and measured mine as Im rewiring at moment anway, I get .7 ohms on both wires. absolute zero normally suggests no connection but I know some meters will read 1 at the wrong end of the display for no connection. All wires have some resistance.

 

 

just to be anal, you're meter is say I with open leads which means infinity. not 1 . although it looks like 1 on an lcd display.

 

0 means no resistance which as already stated is almost impossible due to test probes and the resistance of you're test leads themselves.

 

absolute zero means as cold as anything could ever get -273 degrees C

 

yes i'm a cock!

[Rob_the_Sparky 9]

just to be anal, you're meter is say I with open leads which means infinity. not 1 . although it looks like 1 on an lcd display.

 

0 means no resistance which as already stated is almost impossible due to test probes and the resistance of you're test leads themselves.

 

absolute zero means as cold as anything could ever get -273 degrees C

 

yes i'm a cock!

 

LOL, and I thought I was bad!