Engine room exhaust blowers

[skater]

Today I found that my port and starboard engine room exhaust blowers came on by themselves. The indicator lights were on but the switch was in the off position. I had to open the 32 volt breakers to get them to shut off.. I thought it was the switch and changed it with the same result, blowers on. I tested the old switch and it is not shorted. Is there a second source from another system that would energize the blowers and the load side of the switch? Im thinking the fire control system maybe?

 

[av8torrich]

What happens when when you check the continuity of wires which attach to the switch, without the switch installed?

 

[dottieshusband]

On mine, you can turn them on from the flybridge, or pilothouse....

 

[av8torrich]

A short in the second switch would certainly explain this problem!

 

[skater]

I think you may have found the problem. I put the upper helm cover on.Most likely I hit the upper switches. I will check. Thanks to all for the help.