66 series wiring

[1566]

I'm working on a very cobbled together 1566 I purchased.  The wiring is an absolute nightmare of scotch locks and stripped and taped connections. 

I have downloaded the wiring schematic from the 1566 repair manual from IH, but it is not a good Pic or schematic layout. Does anyone have something better to reference? 

[1967806]

1 hour ago, 1566 said:

I'm working on a very cobbled together 1566 I purchased.  The wiring is an absolute nightmare of scotch locks and stripped and taped connections. 

I have downloaded the wiring schematic from the 1566 repair manual from IH, but it is not a good Pic or schematic layout. Does anyone have something better to reference? 

At one time Bermuda Ken posted some links on here for some schematics. Cant remember when it was or the thread title now. I have some that I copied from that thread. What part of the schematic you needing? I had a 1066 BS in the shop awhile back that was that way. King of Scotchlocks got ahold of it. Wizbangs crimped a scotchlock to a wire about 2 inches from a threaded stud with ring terminals on it to get power for a CB or something. 😩 That was just one of the surprises I found.

[Drysleeves]

Might be better to re-harness the tractor and avoid possible issues such as a fire.

[756puller]

For 1000 dollars you can get all the harnesses perty much 

[Jeff-C-IL]

I strongly advise you to get rid of the mess, call Porch Electric and get a new harness.   I actually build harnesses - have all the professional tools and parts - and I would still not try to repair old tractor wiring and would order them rather than build myself.   

Patched old wiring is just more headaches going to happen at the worst possible time.   The wire is usually all brittle & corroded, simply beyond successful repair

[HydroTek]

The '66 harness is pretty simple as far as harnesses go

just pull it out and make or buy a new harness

The old insulation will be brittle anyways

[1566]

2 hours ago, Jeff-C-IL said:

I strongly advise you to get rid of the mess, call Porch Electric and get a new harness.   I actually build harnesses - have all the professional tools and parts - and I would still not try to repair old tractor wiring and would order them rather than build myself.   

Patched old wiring is just more headaches going to happen at the worst possible time.   The wire is usually all brittle & corroded, simply beyond successful repair

There's no way I'm paying 1200 bucks for a harness.  I am a mechanic.  All I'm looking for is a readable schematic that I can reference. 

[snoshoe]

I have 8 or 9 pages on my phone that were downloaded from cngco.com when they were still on the web. They are scanned from the service manual. Maybe a few fingerprints but seem clear enough to me. Tried the ad files button but they refuse to upload.

[tractorholic]

New harness beats a pita scabbed together harness any day in my book. Whether you’re a mechanic or not. You said yourself it’s an absolute nightmare. I’m not trying to make anyone mad but agree with some of the others. Some of these older tractors catch fire because of bad wiring 

[1566]

36 minutes ago, snoshoe said:

I have 8 or 9 pages on my phone that were downloaded from cngco.com when they were still on the web. They are scanned from the service manual. Maybe a few fingerprints but seem clear enough to me. Tried the ad files button but they refuse to upload.

Could you email them to me? Chanlkyle@gmail.com 

[1566]

19 minutes ago, tractorholic said:

New harness beats a pita scabbed together harness any day in my book. Whether you’re a mechanic or not. You said yourself it’s an absolute nightmare. I’m not trying to make anyone mad but agree with some of the others. Some of these older tractors catch fire because of bad wiring 

I'm obviously going to cut out all the bad, just need something to go by.

[acem]

My 826 has a bad wiring harness.  I disconnected it.  Then ran a wire from the one wire alternator to the starter battery stud (where the batter cable goes).  Then a wire from the starter battery stud to the starter button and another from the button to the starter engage stud.

Very simple and effective for basic operation.

Starts the engine and charges the battery but no fuel guages, lights, etc.

[Mike56073]

man i absolutely hate scotchlocks, those things should be outlawed.

[Bermuda_Ken]

The main and dash harnesses from Porch are $ 450.  Those 2 will get you 95% fixed. 

IDK where anyone is getting the $1200 figure from.  Even buying them from CNH is only $820.

The more you REALLY look into them, the worse they are.  No sense to patch them at all. 

 

[stronger800]

1 hour ago, Mike56073 said:

man i absolutely hate scotchlocks, those things should be outlawed.

11 hours ago, acem said:

My 826 has a bad wiring harness.  I disconnected it.  Then ran a wire from the one wire alternator to the starter battery stud (where the batter cable goes).  Then a wire from the starter battery stud to the starter button and another from the button to the starter engage stud.

Very simple and effective for basic operation.

Starts the engine and charges the battery but no fuel guages, lights, etc.

 

But if you wanted, the same very simple and effective process, Could have your fuel gauge and lights working with just a few more new wires.  
 

If a new harness is out of  the question, and the  1556 does not have a cab and air conditioning, It certainly would not be hard to run wires and make it all work if a guy wanted to. 

[stronger800]

I missed the above post, $450 is a no brainer 

[1566]

Thank you to the couple guys that emailed me the schematic to go off of! 30 minutes and were back in business!

[stronger800]

Pull the plug off the clutch safety switch and stick a fence staple in it?  Gotta wrap it in tape to be good  

[1566]

1 minute ago, stronger800 said:

Pull the plug off the clutch safety switch and stick a fence staple in it?  Gotta wrap it in tape to be good  

Why? It works properly hooked the way it was designed. 

[stronger800]

Sorry I was kidding. You said it was all a mess.   Mine all work too, it’s not like they are complex. 

[Shell1066]

Paid 870 for a complete harness for my 1066 two years ago. Best thing I ever did. When i sold it I could sleep knowing I did half )(*& it and cheat the next guy.

[7and8and1456]

My '56 series tractor Operator's manuals have diagrams showing all wires and a page of text telling names of wires , color of them and what they connect to. Did 66 series manuals not have that?

[Shell1066]

4 minutes ago, 7and8and1456 said:

My '56 series tractor Operator's manuals have diagrams showing all wires and a page of text telling names of wires , color of them and what they connect to. Did 66 series manuals not have that?

My set of books had  very good set of diagrams. Got them from Peaceful creek.

[acem]

9 hours ago, stronger800 said:

Pull the plug off the clutch safety switch and stick a fence staple in it?  Gotta wrap it in tape to be good  

I've seen many with the two wires stripped and connected with a wire nut.

Actually looks decent but eventually works loose.

I prefer a custom jumper wire.

[stronger800]

Two male spades, the yellow sized ones, and a 1” U of wire? (Never seen such a thing….).