[Joeztech]

I often reheat the solder on coil terminals and use some rosin core flux or add a small amount of new solder along with some rosin flux to renew the connection. If there was a poor solder connection in the beginning it will often establish a new good connection. the soldering operation does not create the stress that pushing on an old coil terminal with an ohm meter probe/s would. Some good needle-point ohm meter probes do help in dealing with old oxidized solder.

Joe
KC5LY