[Healeys] Distributor to spark plug lead continuity

[Bob Spidell]

First, why on earth did you have a spark plug lead on a radiator cap??? 
(presume you meant 'distributor' cap?)

It looks like you have your multimeter set to diode test (maybe that's 
how continuity works on your MM?).  The reading is probably ohms, 
indicating a very low resistance circuit, but to be sure turn the MM 
control knob one click clockwise, to the 200 ohm range ('200 omega').  
It'll probably give the same reading; i.e. .792 ohms, which is about 
what you'd expect from a short stranded copper wire lead (IIRC, one ohm 
per foot of cable is considered normal, even copper has some resistance).

Bob


On 5/21/2020 7:55 AM, Linwood Rose via Healeys wrote:
> Hi guys,
> Educate me. When doing some preventative maintenance, I pulled a spark 
> plug lead out of the radiator cap (using a 123 distributor) the cable 
> pulled away from the terminal - not a particularly unusual outcome. 
> Got a new 90 degree terminal and crimped it on to the cable (Pertronix 
> cable) and before I put the boot on the end of the cable I thought I 
> would check the continuity. It barely dropped below 1.
>
> So then I checked a brand new, never used, cable made-up by AH Spares. 
> As shown in the image below when the sensors are attached to each end 
> of the cable I get a reading of .792 which is not sufficient to even 
> sound the beeper on the multimeter device. I suppose there are degrees 
> of continuity (not just on/off) but I guess I expected the alarm to 
> sound and the reading to drop to near zero.
>
> Could someone interpret these findings for me?
>
> Thanks, as always.
>
> Lin
>
>
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