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Subject: 1949 8N Wire Routing

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Rick L.    Posted 10-25-2019 at 12:37:33 [URL] [DELETE]        [Reply] [Email]  
  • 1949 8N Wire Routing
  • Is there a diagram or pictures somewhere that shows how the wiring should be routed on my 8N. It would be nice if it would include all the fasteners, etc. I am converting my 8N from 12v back to 6v and I want to do it correctly.

    Thanks,
    Rick L.

    Tim Daley(MI)    Posted 10-25-2019 at 16:14:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1949 8N Wire Routing
  • HiYa Rick-
    Are you doing a restoration? The Ford OEM system was 6V/POS GRN so we will surmise you are staying with the original. Do you have the 3-Wire/3-Brush or 3-Wire/2 Brush if after s/n 263844 generator? The OEM 8N VR was the AUTO-LITE unit – see attached picture. The bad news is nobody repops them or makes parts, rubber insulator feet included. The there was a mounting plate too. If you don’t have another to use, providing it a good, then you will have to bite the bullet and get one of the new aftermarket units. They sell one with the backing plate see JUST8NS. Here are some wiring diagrams to help you with plus the LINK below is from our HOW-TO’s forum, ELECTRICAL, “WIRING PICTOGRAMS by JMOR”, an excellent step by step pictorial on every wiring config for the N’s. All of these diagrams are in the essential manuals.

    FORD 8N TRACTOR OEM WIRING DIAGRAMS:




    EARLY FORD 8N WIRING – CORRECT, RESTORED AS OEM BY STEVE DABROWSKI:

    FORD 8N TRACTOR ESSSENTIAL OWNER/OPERATOR/PARTS/SERVICE MANUALS:

    Tim Daley(MI)

    Rick L.    Posted 10-26-2019 at 04:59:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1949 8N Wire Routing
  • Just rewiring at this point, but I like to make things as close to stock as possible. I appear to have a 3 wire/3 brush generator, but I do not know if it has been converted to 3 wire/2 brush.

    Thanks,
    Rick L.

    Tim Daley(MI)    Posted 10-26-2019 at 07:19:41 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1949 8N Wire Routing
  • Moanin' Rick-
    Is system 6V/POS GRN? If you have a 3rd Brush, on any early Ford generator, there will be a 3rd Brush Adjustment Screw on the back panel. The exception is the early 9N-100000-A, was a 2-Wire/2-Brush unit, and 9N-10000-B, was a 1-Wire/3-Brush unit with the 3rd Brush on the back panel with a "HI-LO" slider push button. However, some of these 3rd Brush units were changed over to 2-Brush units and the only way to tell for sure is to inspect the guts. You do not need to convert a 3-Brush to a 2-brush. If it's as is, leave it. Have a qualified starter/alternator shop who knows Ford generators to inspect it, rebuild if needed, and adjust for efficient output. 3rd Brush use was intended to use when operator used headlights and the amp draw was greater. You'd adjust to a higher setting and then when lights not used, turned back down so as not to over charge the battery. Have your shop guy tweak your VR as well and leave it. Nowadays there is no need to adjust the 3rd Brush if it is set correctly. Output rating on the 9N-10000-C unit thru the 8N-10000-A generator was 11.5 amps. The 8N-10000-B generator released the 2-Brush/20 amp unit. There is a Service Bulletin that details how to change a 3 Brush to a 2-Brush. Your call if'N ya wanna switch. Also important to know all (except the early 9N-A unit) were the 'A' Circuit Design so polarizing the generator is simply arc sparking the BAT and ARM terminal on the 8N VR, or on the roundcan cutout, ARM terminal to BAT. It's also important to have the proper fan belt and belt tension on a generator. The 8N used a short two-bolt hole plate that connected to the mounting bracket and a governor bolt. Many of these got lost when servicing the generator and end up with no belt tension at all -the generator unit will not sustain the tension on its own. I made a dozen of these per original drawing if you want one.

    FORD 8N-100000-A TRACTOR GENERATOR, 3-WIRE/3-BRUSH 11.5 AMP, ‘A’ CIRCUIT:

    3RD BRUSH ADJUSTMENT SCREW ON PACK PANEL:

    8N-10000-A GENERATOR w/ 8N-10145 TENSIONING ARM:

    FORD 8N TRACTOR GENERATOR - POLARIZING via THE VOLTAGE REGULATOR:

    Tim Daley(MI)

    Rick L.    Posted 10-27-2019 at 04:29:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1949 8N Wire Routing
  • Tractor was converted to 12v when I got it. Taking it back to 6v stock. I had to open up the generator I got for it to get it working and it is a 3 wire/3 brush.

    Tim Daley(MI)    Posted 10-27-2019 at 11:24:26 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1949 8N Wire Routing
  • OK - 3-wire/3-Brush is fine, I'd leave it as is. Get a new, correct VR and if you need the tensioning arm, I'll send you one. Email is open.


    TPD

    JMOR    Posted 10-25-2019 at 14:38:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1949 8N Wire Routing
  • one of many. maybe helpful.

    Rick L.    Posted 10-25-2019 at 15:35:27 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1949 8N Wire Routing
  • Very helpful, thank you.

    I'm still struggling on mounting the voltage regulator. Do any vendors have the rubber isolaters? Also, looks like I am going to have to get a new reg to get the adapter plate. Is the adapter plate in place of or in addition to the original mounting plate? Assuming there was an original mounting plate.

    Thanks again,
    Rick L.

    JMOR    Posted 10-25-2019 at 20:41:37 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 1949 8N Wire Routing
  • Adapter plate is to adapt today's VR mounting holes to the 8N, which used the AutoLite VR with different mounting hole arrangement. There was a mounting plate for old AutoLite VR as well. The current day adapter plate has holes for both types, but to accomodate this, it does have a different shape.


    Rick L.    Posted 10-26-2019 at 04:53:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: 1949 8N Wire Routing
  • Thanks, that clears up a lot for me. Surprising that no one is reproducing the old style voltage regulator.

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