1975 135 HP Wire Terminal Issues

Randyg123

Petty Officer 1st Class
Joined
Apr 20, 2008
Messages
337
I have noticed some discrepancies between my wiring diagram and what is really happening at my Wire Terminal. On the attached photo, each wire is colored and leading to, as described below. I am calling the Main wiring harnes from the controller, the "Main Buss":

From Left to Right
Terminal 8
Top - Red to Main Buss
Bottom - Red to Rectifier (VARO R315 7744)
Terminal 7
Top - Brown to Buss (Should be Grey to tach)
Bottom - Yellow/Grey to Rectifier
Terminal 6 (Shunted to 7)
Top - Yellow/Grey to Stator
Terminal 5
Top - Yellow to Stator
Bottom Yellow to Rectifier
Terminal 4
Top - Purple/Yellow to Temp Sender on Water Passage Cover
Terminal 3
Top - Purple to Temp Sender
Top - Brown to Main Buss
Terminal 2
Top - Brown/White to Main Buss
Bottom - Purple/White to Choke
Bottom - Purple/Yellow to Choke

Most of these are correct with respect to my wiring diagram. On terminal 7 the wire could be grey and now just looks brown or there has been a little work done here. I hooked my tach up to the grey wire at the controller and it works fine. On terminals 2 and 3 the purple and purple/white wires from the main buss appear to have been changed to brown and brown/white

What is really odd is how the temperature sender and the choke are wired. This can't be right. Both choke leads go to the same terminal (2) instead of being across terminals 2 and 4. The temp sender should be across terminals 2 and 4 as well, but is connected to terminals 3 and 4 instead.

Is temp sender at the water passage cover a part of the 'Fast Start' system that I did not think I had. Is this correct? If so, it appears that it is disconnected, bypassed, or otherwise tampered with. Hopefully the reason I am having problems with setting my timing correctly. But i am affraid to just go and re-wire everything as it should be without checking with you all first.

Please let me know if I need to clarify anything.
 

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F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: 1975 135 HP Wire Terminal Issues

The choke wireing is the resultof a factory service bulletin. Because of flooding during warmup, they reccommended putting both wires from the solenoid on the same screw, connecting to the wire coming from the choke switch. That way it full chokes when, and only when, you operate the choke switch, giving you full control over the choke.
 

Randyg123

Petty Officer 1st Class
Joined
Apr 20, 2008
Messages
337
Re: 1975 135 HP Wire Terminal Issues

Great,

Thanks for the assist. What about the temp sender on the 'water passage cover'? Is this a part of the "Fast Start" option? I was not aware that there were two temp senders. One here and one on Cylinder 3 that was connected to the horn.
 

wavrider

Chief Petty Officer
Joined
Nov 26, 2007
Messages
543
Re: 1975 135 HP Wire Terminal Issues

It is possible to have both banks with a temp sensor wires in series to your overtemp horn.

You still chasing Gremlins on that old 135? Hope you find them all and get back on the water soon.
 

Randyg123

Petty Officer 1st Class
Joined
Apr 20, 2008
Messages
337
Re: 1975 135 HP Wire Terminal Issues

It is possible to have both banks with a temp sensor wires in series to your overtemp horn.

You still chasing Gremlins on that old 135? Hope you find them all and get back on the water soon.

Waverider, welcome back. I have seen you post in a while. Yes, the Gremlins runneth amuck. Getting closer but the timing issue prevails.

Nears as I can tell, the Temp Horn is completely isolated from the other sender.

How does this choke system work? If they were wired as original from the manufacturer, there would be two paths to the choke - one through the switch and one through the sender. I am assuming that the sender is basically in parallel and would over-ride the manual setting when the the sender is cold. As it stands now with the Service Bulletin fix, both leads on the choke are connected directly to the choke switch. That means both connectors go to the manual switch. Is there a reason for this? Why not just cut off the leads from the sender, and just connect the P/Y lead from the choke to the P lead from the switch? Why the redundency with using the P/W lead?
 

Randyg123

Petty Officer 1st Class
Joined
Apr 20, 2008
Messages
337
Re: 1975 135 HP Wire Terminal Issues

^^^^
The server was so busy yesterday I had a tough time getting my question posted in a timely manner! Guess a lot of boats went out for the first time this weekend.
 
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