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Author Topic:   Merc 135 Warning Lights
huladick posted 02-10-2004 09:54 PM ET (US)   Profile for huladick   Send Email to huladick  
I tested a 2000 18' Dauntless over the weekend witha 135 Optimax.

During the run, a warning light came on. The salesman said it was the throttle position light. He shut the motor off and restarted it without any further problems.

It scared me off, as the boat has no warranty.

Is this a big deal or a potential problem ?


Cole posted 02-10-2004 10:08 PM ET (US)     Profile for Cole  Send Email to Cole     
Hmmm...if you're talking about the four-funtion warning indicator gauge it could be any number of items. I'm no expert but when mine went off multiple dealers/techs told me the same thing "throttle position sensor" but what it turned out to be was some sort of air injection pump. Thankfully my 150 Opti was covered under wasn't an inexpensive repair.
bsmotril posted 02-12-2004 11:14 PM ET (US)     Profile for bsmotril  Send Email to bsmotril     
Mine sometimes does the same when the motor is started if it has not been run in several weeks. Re-boot the motor and it goes away. One thing that will make it come on reliably is starting the motor with the fast idle interlock engaged. It has to be started with the throttle in the closed position. Last time I lubed my cables and linkages, it got better for a while. It is pretty infrequent, I just live with it and will have the dealer check it out at my next service in 50 hrs. BillS
Dauntless18 posted 04-21-2004 07:18 PM ET (US)     Profile for Dauntless18    
I have a 1998 Optimax 135 and the same beeping came on this last weekend (LI Sound - me and maybe 10 other boats out there - beautiful day). Sunglare made it difficult to see, but it looked like the throttle light. I turned off the engine and restarted and it went away, go figure. Engine ran like a top. Any other thoughts on this? I would rather not use my Sea-Tow membership.

prm1177 posted 04-22-2004 04:25 PM ET (US)     Profile for prm1177  Send Email to prm1177     
I believe this is a common occurence with the Opti 135. The sure way is to trigger it is to use the fast idle start as Bill mentions. Mine will do this once in a while (particularly if the engine hasn;t been used in a while). If the fault doesn't come on after a restart, I wouldn't worry. When this first happened on my 97 Outrage 17, I was concerned. My mechanic and I tested the system and found that while it was possible to trigger a false alarm, the system does work reliably when there is a problem or if a sensor is out. I'd be concerned only if the warning system sounded a second time after reset, or if the alarms come on at speed. Other than that, I like my motor.


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