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Farmall & IHC Tractors Discussion Forum
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806 voltage regulator

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Rhino

05-21-2006 06:56:06




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Hello, I have an 806DT with all new wiring harness, alternator, resistor, keyswitch and voltage regulator. I have a low draw down on the batteries with the key switch off thru the amp telilite in the dash. Everything appears to look like the owners manual shows. The red wire is a hot wire to the 3 terminal on the voltage regulator. This factory harness has a second wire going from the 3 terminal to the resistor. This looks like the owners manual shows. This energizes the blue wire up to the amp telilite. Should this red wire to the 3 terminal be hot with the switch off? If so what happens to stop energizing the telilite. Any ideas appreciated. Sorry, my wiring skills are minimal at best. TIA

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Allan In NE

05-21-2006 11:25:05




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 Re: 806 voltage regulator in reply to Rhino, 05-21-2006 06:56:06  
Rhino,

Have you ran an ohm's test thru the big connector on the alternator? That's how they act when there is a leaky positive diode (light stays on dim with the key off).

Just thinkin' out loud,

Allan



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Rhino

05-21-2006 12:59:44




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 Re: 806 voltage regulator in reply to Allan In NE, 05-21-2006 11:25:05  
Hi Al. No, But I have had the new alternator checked at an auto electric shop. Also this problem was present before I installed the new alternator and persists when the alternator is on the tractor or off. I did not feel that the alternator was a player in this problem but renewed it as part of my restoration. Right now I have almost the entire harness disconnected form any sources that could draw power(starter, alternator, lights, left side of dash ect.)It still seems to me that I am missing something in the voltage regulator area if the red lead to the 3 terminal is a hot lead with the switch off. Thanks for your thoughts...any help is appreciated!

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Bob

05-21-2006 08:28:04




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 Re: 806 voltage regulator in reply to Rhino, 05-21-2006 06:56:06  
That's a GOOD question! I was looking at a hand-drawn diagram sent to me by someone working on the electrical system on a 656, and it is connected as you describe, and it appears there would be a current drain through the "idiot light" with the keyswitch "OFF".

I have a Blue Ribbon electrical manual at the shop that I'm sure covers the 806, and I'll take a look at it when I stop by the shop, hopefully later today, and post back.

Email me, if you'd like.

bigcoulee@hotmail.com

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Rhino

05-21-2006 10:27:18




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 Re: 806 voltage regulator in reply to Bob, 05-21-2006 08:28:04  
Thanks Bob for replying. Yes, it looks like you see the same picture that I do. My Case IH Owners Manual shows a resistor-voltage regulator diagram just as described and I'm told the 3 terminal should be a hot lead to the regulator and then jumping to the resistor from the 3 terminal. I'm not much of an electrician but my test light says this won't work unless I'm missing something else. All my new harness sure looks to connect up nice...can't really remmeber anythig different from the old harness....but the old harness didn't seem to keep the batteries in great condition. Would apreciate anything you come up with.

Rhino

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Bob

05-21-2006 11:00:52




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 Re: 806 voltage regulator in reply to Rhino, 05-21-2006 10:27:18  
Rhino,

Any idea of the Ohms value of the replacement resistor?



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Rhino

05-21-2006 13:08:23




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 Re: 806 voltage regulator in reply to Bob, 05-21-2006 11:00:52  
HI Bob. No I don't know but will check and see. I have asked the dealer to varify the part though and he says that it is correct. I do not have a spec book or shop guide other then my IT manual which does not give me much to work with. The wiring schematic for 806D that I have does not really show that the 3 terminal should be a hot lead but....that is different than what people tell me? Thanks for your reply again and I'll check into the resistor Tomorrow.

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Rhino

05-22-2006 06:43:45




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 Re: 806 voltage regulator in reply to Rhino, 05-21-2006 13:08:23  
Well, now I'm talking to myself. The main harness part number is confirmed to be correct(385012-R91 for an alternator diesel). However the hot wire to #3 terminal of the voltage regulator connects to the hot lead from the starter at the multiple connector on the right side of dash which goes to the key switch? My old schematic shows the lead to the voltage regulator connecting to the (pink) wire from the fuel receiving unit(guage in the dash). This would not allow the flow of current until the switch is turned on.????? I have my doubts about this new harness. Wondering if anyone else has experienced this before or can confirm that the lead to number three on the voltage regulator should be a live wire with the switch off? Rhino

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Rhino

05-22-2006 18:18:42




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 Re: 806 voltage regulator in reply to Rhino, 05-22-2006 06:43:45  
Bob if your still reading up on my problem I have a couple of things to add.I have decided that the old diagram is correct and the voltage regulator should not have a hot wire to #3 terminal until the switch is on.. After checking my neighbors 756 I came to this conclusion. I'm pretty sure my harness is not correct and the lead down to the voltage regulator should be changed with the lead going to the lights on the left side of dash. They both look like the same color and I think they were interchanged during factory assembly.Switching them will give me a hot lead to the light switch(it's spliced with the hot wire from the battery to the key switch, so the lights work without the key switch on)and a lead to the voltage regulator that will only become hot after turning on the key switch(spliced with a pink wire from the fuel guage receiving unit that is only hot after turning on the key switch). Now this seems obvious to me! I have the harness pulled and going to get the new ends to solder back on tomorrow so I can switch the leads. Thinking I got it figured out! If Your still reading and find any thing out feel free to let me know. Thanks..... Rhino

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Bob

05-23-2006 21:53:01




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 Re: 806 voltage regulator in reply to Rhino, 05-22-2006 18:18:42  
Rhino,

I finally got out the Blue Ribbon Service Manual tonight.

Simply put, #3 is connected to the side of the key switch that is only hot when the switch is "ON".

#4 is connected to the "idiot light", which is then connected to the same place as #3.

The resistor is connected BETWEEN #3 and #4.



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Rhino

05-24-2006 05:20:30




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 Re: 806 voltage regulator in reply to Bob, 05-23-2006 21:53:01  
Thanks Bob for taking the time to post back your findings. Very surprising to me that IH service people were giving me some incorrect advice on the three terminal lead. I've got the new ends for my harness to make the conversion over to match my last post and yours. Ya,I love it when you finally get a problem figured out and wiring is just plain hard for me. Can't wait to get the old girl back together. Thanks again! Rhino

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