'83 175hp Temp sender, horn and OEM manual

[RobsTV]

4 questions.

Swapped from a '75 135hp Evinrude to a '83 175hp Evinrude.
Previously installed a telex temperature gauge for the 135, that had it's own wire going from gauge to sender on starboard side head (previous owner installed sender and wire to console, but old gauge went bad).

Trying to connect gauge to the 175hp, and when we tied it into the tan wire between controls main engine wire harness, the gauge would instantly go backwards.

I think tan wires go from the 175hp head sensors to horn in remote controls based on Seloc manual. But Seloc manual does not show anything about how to wire temperature gauge. They do show a connector from horn to a plug on remote, but we have older style control without that plug.

1. Is that plug connection on remote control what we need to use to connect temperature gauge?

Or, is the stock setup only for use with a horn, not a gauge?
2. If so, can I simply install temp sending unit from 135hp to the head of the 175?
3. With only one sending unit on one head, does that mean I only have 1/2 the temperature info I should have? Two gauges needed.

Last question is about the service manual.
Have original Factory Evinrude '75 135hp service manual, plus a Clymer manual for that motor published in 1981 (covered '65-'81, 40hp to 140hp). We then bought the Seloc while troubleshooting the 135hp's ignition, hoping it would show us procedure using more modern tools. It did not. The Clymer manual seems like almost an exact copy of the factory manual we have, but the Seloc is far from it, and not nearly as good. The Seloc though does cover our newer 175hp motor. Again, not nearly as detailed as the Clymer.

4. Are the new Clymer manuals like this old one published in 1981, and nearly identical to the OEM factory manuals?

Thanks
Rob

 

[ezeke]

Re: '83 175hp Temp sender, horn and OEM manual

The tan wires on your new setup are strictly temperature switches on/off to sound the horn when you are overheated - around 210 degrees. A gauge requires its own sender and wiring. The sender has to match the particular gauge.

The temperature gauge should take positive voltage from the ignition switch's 'A' terminal-purple wire. The sender terminal on the gauge will connect to your new tan wire and run back to the cylinder head where the sender will be grounded to the cylinder head.

If you want lighting on the gauge, you will need a blue wire to the light switch and a separate ground.

 

[RobsTV]

Re: '83 175hp Temp sender, horn and OEM manual

Thanks,
So do not use stock tan wires (that attach to temperature "switches" on both heads) for gauge, and instead use wire dedicated for temperature gauge sending unit. Since gauge is already installed and wired correctly for old motor, (worked great), with positive voltage and lighting features functioning, and it's own dedicated wire going to transom, I can simply remove temperature gauge sender that was working with 135hp and gauge, then attach that sender and dedicated wire to newer 175hp and it wiill work.

What about the gauge only connected to one bank? Is that normal, as it seems like it would only indicate 1/2 of the cylinders engine temperature, and would not help with a failure on the other bank?

Also, any info on newer Clymer manual for working in these area's?

Thanks again,
Rob

 

[ezeke]

Re: '83 175hp Temp sender, horn and OEM manual

That's a crap shoot, some use gauges on both sides, or install switches and two senders. I have one temp gauge per motor which I monitor along with the pressure gauge primarily to see that things are normal.

A use OMC model specific service manuals for the engines that I work on. I have a pair of Clymer manuals that cover a lot of years but nothing new. I have only purchased one hard copy of a Seloc manual and I did not like it. I have Pdf. manuals that I purchased which appear to be Seloc manuals but do not say so. I like the pdf manuals because they are easy to search.

None of the manuals have anything like an adequate Index (in my opinion).