Would you use this coil?

[powbmps]

Replaced original Mercury coil 392-805570 with a Sierra coil 18-5438. Mercruiser lists the coil for my motor as part no. 392-7803A4 (primary resistance .6-.8, secondary resistance 9,400-11,700), which cross references to the same Sierra 18-5438. The resistance values I am getting out of the Sierra (1.0 primary, 8,100 secondary) do not fall into the specified range so I was thinking about going back to the old one. However, there is a small crack by each of the posts. Is this an issue? Are the resistance values that important?

http://i1218.photobucket.com/albums/dd415/powbmps/20160930_130646.jpg

Thanks!

 

[bruceb58]

It may just be your meter. Hard to measure 0.2 ohm differences. What brand/model meter are you using?

 

[gm280]

Yes unless you have a micro-ohm meter, I don't see how you could read such low resistance accurately. Try another ohm meter for the secondary value and see. JMHO

 

[powbmps]

I appreciate the responses. I am using a cheap Etekcity meter. To get the secondary I set it on 20k and get 10.04k, 200k gives me 10.0k and 2000k give me 10k. For the primary I set it on 200 and get 1.1, but just touching the probes together gives me .5, so I am subtracting that from the 1.1 to get the .6 primary value.

I have a higher quality unit on order, so I will be making some comparisons when I get it.

 

[bruceb58]

I wouldn't trust that meter for anything but ballpark numbers.

 

[achris]

I agree about the meter. That original coil is usable if you use a very thin dremel disc and grind the crack out slightly, then fill it with a high quality resin or 2 part epoxy.... It would be excellent as a spare (or test unit)...

Chris....