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Testing Ignition Coil and Leads off Vehicle 

 

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 Post subject: Testing Ignition Coil and Leads off Vehicle
Posted: Tue Feb 10, 2015 9:20 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

I've replaced the ignition coil, spark plugs and all leads on my AUII few days ago.

I have is a Digitech from Jaycar Electronics to test the ignition leads to see if they are still good. see pic attached.

Does anyone know what setting I should have on this multimeter? It's different from the others.

What values / readings should I have so I can work out if the leads are still good or bad?

Any tips would be welcome.

Cheers

 

 

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Digitech  Multimeter QM1500.jpg
Digitech Multimeter QM1500.jpg [ 24.38 KiB | Viewed 40 times ]
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 Post subject: Re: Testing Ignition Coil and Leads off Vehicle
Posted: Fri Feb 13, 2015 7:38 am 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

Has anyone used the above brand of multimeter? If so, is the correct setting for testing ignition leads.

Black wire goes to Earth (Com socket) with Selector switch set to 20K.

Readings from ignition leads vary from 2.12 to 2.34.

Should these readings be higher? I did notice a spark coming from lead 2 but cannot determine if this lead is faulty. All leads where removed and replaced with new.

Previous leads were Eagle Ultra Series 8.0mm (never kept the packet so don' know what the range should be on these)

Replaced with Bosch leads 8.0mm

Gregory's Falcon No 274 Service and Repair manual shows how to test ignition leads ( Basically it says place one wire here and another wire there), but no other details provided.
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 Post subject: Re: Testing Ignition Coil and Leads off Vehicle
Posted: Sun Feb 15, 2015 9:50 pm 
Technical Contributor
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Posts: 492

Joined: 13th Jul 2013

Location: Campbelltown
NSW, Australia

black lead in com. and red lead in Vma -set to 200k range initially then set to 20k range for readings below 20k

testing leads with multimeter only gives a general indication of condition - average figure would be 10-15k ohms per meter ,but doesn't tell you if insulation is breaking down or if lead has intermittent fault- if breaking down when hot etc.

no.1=11-28 kohms
no.2=10-25 kohms
no.3=8-23 kohms
no.4=7-20 kohms
no.5=7-19 kohms
no.6=7-19 kohms

coil resistance = primary -0.6ohms - secondary -9.2 kohms

same limitations as testing leads and not many people have a descent coil tester now days apart from that labour and equipment costs make it cheaper to just replace the coil - or you test it and your leads on vehicle with an osilliscope

all readings are approximate as they can very with temp and also brand of meter
8.0mm leads are preferred.
it is still possible to get wire leads which have a lot less resistance but not as common now days and cause interference with electronics........
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 Post subject: Re: Testing Ignition Coil and Leads off Vehicle
Posted: Sun Feb 15, 2015 10:09 pm 
Getting Side Ways
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Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

@ TedW,

Many thanks for that advice and readings. I appreciate your time and effort.

Cheers,
Peter
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 Post subject: Re: Testing Ignition Coil and Leads off Vehicle
Posted: Sun Feb 15, 2015 11:45 pm 
Technical Contributor
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Posts: 492

Joined: 13th Jul 2013

Location: Campbelltown
NSW, Australia

put the old parts aside for possible testing in the future
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 Post subject: Re: Testing Ignition Coil and Leads off Vehicle
Posted: Mon Feb 16, 2015 12:33 am 
Getting Side Ways
Offline

Age: 58

Posts: 1027

Joined: 13th Sep 2010

Ride: Ford Falcon AU 2000 Series II

Location: Eagleby
QLD, Australia

@TedW,

No worries, already done so.

Ran Forscan this arvo for any error codes, no error codes, all good so far.

Next job is for aircon regas and replace Receiver/Dryer and Orifice Filter tube, it's blocked.
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