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1989 Mercury BlackMax 135HP Questions
- Thread starter Figz
- Start date
Figz
Member
Is this the trim sensor?
I’m looking at my wiring diagrams and a wire that is brown with a white stripe seems to be the trim sensor wire. I’m trying to figure out how to get my trim gauge to work, but I’ve tested this wire with a tester and there’s no power going through it when I move the trim up and down.
I’m looking at my wiring diagrams and a wire that is brown with a white stripe seems to be the trim sensor wire. I’m trying to figure out how to get my trim gauge to work, but I’ve tested this wire with a tester and there’s no power going through it when I move the trim up and down.
Figz
Member
Now that the boat has been out a couple times, some of the gauges are either failing or are not working. The boat HAS been sitting for 26 years, could the gauges just be going bad from putting them back in service after being idle for so long?
A new temperature gauge was purchased and it is working. However, the RPM gauge was working and is now not working after the temperature gauge replacement. The tilt trim gauge is still not working at all.
And for the fuel gauge, the sender in the tank is bad on the inside so I have a replacement on order.
What are y’all’s thoughts on any of the gauges? Specifically RPM?
A new temperature gauge was purchased and it is working. However, the RPM gauge was working and is now not working after the temperature gauge replacement. The tilt trim gauge is still not working at all.
And for the fuel gauge, the sender in the tank is bad on the inside so I have a replacement on order.
What are y’all’s thoughts on any of the gauges? Specifically RPM?
Last edited:
jumbofordman
Well-known member
First pic is the trim sensor.
I would just replace all the gauges with a matching set. Get a GPS speedo and never worry about a pitot tube again, plus it'll actually be accurate.
I would just replace all the gauges with a matching set. Get a GPS speedo and never worry about a pitot tube again, plus it'll actually be accurate.
Figz
Member
Thanks for the reply!
Since the last update, I replaced the fuel sending unit in the tank and the fuel gauge is now reading properly. I have an RPM gauge on order and the trim gauge. I guess I might just need to get a new sensor. Are the sensors known to go bad?
Right now as gauges are going bad, I am replacing them with genuine NOS Mercury Quicksilver gauges.
The only gauges right now that are not Mercury Quicksilver are the fuel gauge and the speedometer.
I’ll send a picture of the gauges that I am getting from when I get home as I have the complete mercury book that came with my engine.