Logo
FULL SITE MENU

Warning Horn Issue

J

jhemp3

New member
Last time out, my warning horn sounded. Oil pressure and water temps seemed within normal ranges. I'm guessing a sending unit may be the problem. Suggestions for diagnosing and correcting the problem are much appreciated. I found Fastjeff's video posting from an older thread on the issue but couldn't open the file. Chrysler 318s, 32' 1987 Marinette FBS. Thanks, Jim
 
Last edited:
Sould be either temp or oil warning systems. Start by ensuring all connections at gauges and senders including grounds are solid and clean. I've seen air in the cooling system set off the temp alarm so ensure there is no air in the system. The temp and pressure switches can be intermitent. For the minimum cost, probably worth replacing and if not resolved, you have two spares on board. When you remove the pressure switch, look at the orifice for dirt that may be clogging it (had that happen). I've also had a problem with Fram oil filters. I don't use them anymore; had two fail. Keep us posted.
 
Thanks for the tips. I know where the oil pressure sending switch is but help me out with the location of the temp sending unit.
 
I've had several oil pressure alarm switches go bad. I suggest unplugging it and firing the motor to see if the alarm goes away. If that's not the problem, start disconnecting the temp alarm switches one at a time until the alarm goes away. The temp SENDER unit (front of the manifold) is not in this circuit, so leave it alone.

Jeff

Note: The alarms switches--temp and pressure--at simple switches that close to sound the alarm.
 
As soon as you power up? You mean when you turn the key the horn goes and for a couple of seconds after the engine starts? If so, this is normal as there is no oil pressure yet.
 
No, I mean the horn doesn't sound while engine is idling. As I throttle up the horn begins to sound, softly at first and increases in intensity as engine revs rise. Jim
 
Back
Top