New coils vrs old coil's readings

[Bruce2]

1995 Mercury 135 OG274584...Bought some new Mercury coils..part # 339-832757A4...installed them and motor runs worst now then it did with old coils...So i ohmed out the new coils and the + to - reads ok but when i check the secondary windings from plug wire tower to either + or - post they read 1450 ohm's and Mercury manual says secondary's should be 800 - 1100 ohm's....Now my switch box readings are all over the place and #2 #4 and #6 are miss firing...

[EuropeanAM]

Are you reading from the plug wire TOWER, or from the PLUG WIRE END? Can be a BIG difference....

[Bruce2]

Readings from the tower to the +and-...No plug wire installed

[EuropeanAM]

That's a pretty broad difference... and not one I've seen on the ADI coils (not really had any problems with them in quite a few years).

[Bruce2]

I don't know who made the coils...but all 6 read the same and was wondering if the difference in the secondary resistance would make a difference in the coil output or harm switch boxes.....i realize that the primary circuit reads the same and may the only thing the switch boxes care about....Thanks

[EuropeanAM]

Should not affect switchboxes...

[Bruce2]

Thanks...

[Bruce2]

I had sent an email to supplier and told him of my findings and they are not OEM mercury coils, but i could return them if i wanted to for full refund..

[Bruce2]

I put all my old coils on and i had acquired 2 known good used ones and put all 6 in and motor runs 95% better..starts easier and actually idles now...so i guess im returning new coils...something about the coils motor dont like.

[JOE54]

been there bought a mtr one time to rebuild had some on it like to have never figured it out /wont happen again guarrantee

[Bruce2]

Old girl sounds pretty good to my hard of hearing ears..