I have a 1996 Merc 200 carb. motor. serial #OG258517
My question is, the book a clymer I believe says in the trouble shooting section, to set an ohm meter to the highest scale and place the lead on the Temp sensor lead, and then a good ground. The book then says I should not have any continuity, if I do the sensor is bad. I understand the sensor is open until it over heats, and then closes sending an alarm. SHOULD the sensor have a resistance reading whenthe motor is cold? It is not closed and I have no continuity between grd. and the lead (only one wire). I got a continuous alarm the other day, but water pressure was in spec, and the water coming out the tell tail was only mildly warm. My thinking is I have a bad sensor, or one that is going bad, any thought or advise from you boat Techs. I did a ohm reading on both sensors and got a 625 on one, and a 1300 on the other while the engine was cool. I do not understand the statement of setting a ohm meter and then looking for continuity. Should the sensor have a spec. resistance reading when cold?
My question is, the book a clymer I believe says in the trouble shooting section, to set an ohm meter to the highest scale and place the lead on the Temp sensor lead, and then a good ground. The book then says I should not have any continuity, if I do the sensor is bad. I understand the sensor is open until it over heats, and then closes sending an alarm. SHOULD the sensor have a resistance reading whenthe motor is cold? It is not closed and I have no continuity between grd. and the lead (only one wire). I got a continuous alarm the other day, but water pressure was in spec, and the water coming out the tell tail was only mildly warm. My thinking is I have a bad sensor, or one that is going bad, any thought or advise from you boat Techs. I did a ohm reading on both sensors and got a 625 on one, and a 1300 on the other while the engine was cool. I do not understand the statement of setting a ohm meter and then looking for continuity. Should the sensor have a spec. resistance reading when cold?