Compression test older mercury

[delawarerick]

I read with cdi ignition you should engage the kill switch to protect cdi. I know little about mercs. I never did on omc's. thanks Rick

[skialot2]

Use a starter button to jump the solenoid. Leave the ignition off.

[delawarerick]

Another stupid question it's ok to hook to the 2 large lugs on the starter solenoid or is it better to use the kill switch and controls I know nothing about mercs and don't want to burn something up. Between a stuck lower unit and not knowing electrics I'm lost on this engine. thanks Rick

[25two.stroke]

Hot big lug and the small terminal with a yellow+red wire. Then you wont cause sparks, you are just activating the solenoid which is carrying the load.

[Jim Speros]

The thing why jumper lead or start box on solenoid is preferred is you can stand next to engine and hold the compression gauge. The two big lugs with a wrench will crank it but, will melt the wrench and make a big spark. A jumper lead as 25 suggests from big red to small yellow/red makes very little spark.

[delawarerick]

A big thanks the lower is still stuck but everything else is so far checking out if nothing else I will have a big paper weight.