10 replies to this topic

[TMW.Racing]

Having a few problems setting up my electronic ignition and getting my fuel mix correct.

 

I double checked my coil's resistance (an Intermotor 11410) just to make sure I have the correct coil, but could only get 0.3 ohms! Correct me if I'm wrong but should it not be 1.5 ohms?

 

I was checking this using my multimeter set to 20ohms, connecting the multimeter to the +ve & -ve poles on the coil.

 

Please tell me i'm doing something wrong and that the coil isn't duff!! 

 

Thanks

[bmcecosse]

If for a ballast system - then yes 1.5 ohms.    Non ballast = 3.2 ohms.  

[TMW.Racing]

I believe looking into it a bit more, the Intermtor 11410 is a direct replacement for the Lucas DLB198, which I believe is a ballast coil.

 

key thing for me to know is does a resistance of 0.3 ohms indicate that (A) the coil is knackered (its new within the last 4 months) or (B) I'm being a tool and measuring it wrong?! :-p

[Tamworthbay]

Apologies if I am teaching granny to suck eggs, but have you got it on the right scale? The reason I am asking is that the actual and expected figures (dependant on coil type obviously) are out by a factor of ten, so could be that perhaps?

[TMW.Racing]

No don't worry I'm glad of any help! On the multimeter I had it set to the lowest setting, 20ohm - is this wrong? I really need to buck my electrical ideas up!

[TMW.Racing]

when I say 20ohms, of course I mean 200 ohms..... 

[KernowCooper]

You are checking the ohms without any wiring connected ?

[TMW.Racing]

I did with all but the 12v feed to the +ve pole disconnected, although this wasn't done on purpose. I will check again with everything disconnected.

 

I take it a reading of 0.3 isn't a known failure mode then?

[KernowCooper]

If your coil is reading that low ohms and your meter is accurate then no its not a reading I'd expect to see.

[dklawson]

I did with all but the 12v feed to the +ve pole disconnected, although this wasn't done on purpose. I will check again with everything disconnected.

 

I take it a reading of 0.3 isn't a known failure mode then?

 

As above, mark and remove all the low-tension wires before making the measurement.  Set the meter to the 20 Ohms maximum scale if the meter is not auto-ranging.  Lastly, touch your meter's probe tips together, wait and watch the display.  Whatever reading is on your meter with the probe tips held together is the 'zero' value which must be added/subtracted from the meter's reading when you measure the coi.

[TMW.Racing]

 

I did with all but the 12v feed to the +ve pole disconnected, although this wasn't done on purpose. I will check again with everything disconnected.

 

I take it a reading of 0.3 isn't a known failure mode then?

 

As above, mark and remove all the low-tension wires before making the measurement.  Set the meter to the 20 Ohms maximum scale if the meter is not auto-ranging.  Lastly, touch your meter's probe tips together, wait and watch the display.  Whatever reading is on your meter with the probe tips held together is the 'zero' value which must be added/subtracted from the meter's reading when you measure the coi.

 

 

Ahhhhh thats where I'm going wrong! it starts on 1, so that would make it around the 1.3 mark then, which is an improvement!

 

Will run through that again tomorrow, with everything disconnected and report back. Sounding better though!

 

Thanks

Edited by TMW.Racing, 07 December 2014 - 07:46 PM.