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Subject: ammeter

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chris eby    Posted 04-29-2018 at 18:58:14 [URL] [DELETE]        [Reply] [Email]  
  • ammeter
  • what is the difference between ammeter part # 9n 10850-A and ammeter part # 9n 10850-B ? thanks,chris

    Tim Daley(MI)    Posted 04-30-2018 at 04:49:41 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • HiYa Chris-
    The FORD TRACTOR Ammeter, first released as part number 9N-10850, was a -20/+20 scaled amp meter used on the first 4000 units. It had four screw terminal posts, two of which were wire terminals, two others were for the mounting bracket. At or around s/n 9N-4000, Ford made it obsolete ad released the new -30/+30 Induction Ammeter, part number 9N-10850-B often called the ‘loop’ style because it comprised a steel loop on the rear panel which now the wire was not cut and sliced but simply passed thru the loop and by means of electrical induction, would power the meter. The Ford basic part number for ammeters is 10850, meaning a Model A, or early V8, or 9N Tractor all carried it. It is the part prefix which designates the type and would be the first module the unit was used on. Thus, a ‘9N’ prefix means the specific device was first used on the 9N tractor. When a part has a suffix letter it means there was engineering change that defined the part as being revamped. Sometimes you will see a suffix like “A-1” which denotes that there are two or more suppliers of the same part. Might be TMI…but hope it answers your inquiry.

    FORD TRACTOR ORIGINAL 9N-10850-A 20/20 AMMETER:

    FORD TRACTOR ORIGINAL 9N-10850-B 30/30 LOOP/INDUCTION AMMETER & AFTERMARKET STYLE:

    EARLY 8N CORRECT DASH WIRING w/LOOP/INDUCTION AMMETER UPPER RIGHT:

    Tim Daley(MI)

    Kimberly    Posted 04-30-2018 at 13:50:44 [URL] [DELETE]        [Reply] [Email]  
  • Re: ammeter
  • My 8N has a non-working loop style amp meter; water entered the amp meter housing. I found a loop style amp meter on ebay; the auction included an oil meter which has a different style bezel on it. It was listed in a way that no one noticed it and I only paid a few dollars for the lot. I noticed the seal is out of place on the amp meter. Is it possible to put a new seal in the amp meter or are they made in such a way that it is not possible to service them? My BIL restores camaros and has reconditioned original meters for them so I was going to see what he had to say. I purchased a new wiring harness as the current one is in shambles and intend to do some work on the Old Girl this summer.

    Tim Daley(MI)    Posted 04-30-2018 at 15:03:02 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • HiYa Kim-
    There are several places that restore vintage gauges, speedometers, clocks, radios, dash parts. Just Google speedometer shop. Now, best you are sitting down. The cost is not cheap. In 2003 when I restored my early 8N, I had my original gages restored at shop here in Detroit. For the cost of those alone I could have bought half of another tractor. You can shop around, HEMMING MOTOR NEWS has lot of ads all the time but they are all pretty much priced the same. Getting the back plate removed and not breaking the glass faceplate is the tricky part. Then getting it crimped back over has the same problems. They have the equipment/machines to do that effectively. I have two coffee cans full of original LOOP ammeters waiting to be restored.

    Tim Daley(MI)

    Kimberly    Posted 04-30-2018 at 15:46:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • This tractor probably will never be restored. I do plan on fixing her up a bit. Maybe the aftermarket gauges will be just fine. Thanks Tim.

    Tim Daley(MI)    Posted 04-30-2018 at 17:19:28 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • Aftermarket gauges fit and work fine. I also have a coffee can full of different ones too. I can pick a nice one out for you or send pictures of what I have and you choose...you pay shipping. If you're not planning on restoring it and the ammeter works now, don't fret over it. You want to have good working ammeter for sure but the old adage, "...if it ain't broke..."

    Tim Daley(MI)

    Kimberly    Posted 05-01-2018 at 13:13:00 [URL] [DELETE]        [Reply] [Email]  
  • Re: ammeter
  • Here is the current ammeter. As you can see, it is toast. This was an original ammeter with the loop induction pickup.

    chris eby    Posted 04-30-2018 at 05:31:35 [URL] [DELETE]        [Reply] [Email]  
  • Re: ammeter
  • that is the information that I needed to know.thanks so much tim.chris

    Tim Daley(MI)    Posted 04-30-2018 at 06:58:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • Here is another picture that didn't come thru in my earlier post. It is the one of the original 30/30 Loop Gauge and the Aftermarket style showing the back sides. Loop visible at bottom of Induction Style, with the Aftermarket style gauge showing screw wire terminals doubling as mounting bracket fasteners as well. The info on the part numbers is in the first 9N MPC too.

    Tim Daley(MI)

    chris eby    Posted 04-30-2018 at 11:03:50 [URL] [DELETE]        [Reply] [Email]  
  • Re: ammeter
  • I have a 30 amp gage but the back where the wire goes through looks more like the the gage in the 8n picture.i will email a picture.most likely not original to a late 39 tractor.chris

    Tim Daley(MI)    Posted 04-30-2018 at 13:25:15 [URL] [DELETE]        [Reply] [No Email]  
  • Re: ammeter
  • The original 9N Ammeters had chrome bezels (oil gauge too). They did change to black painted over brass housing later on, but not sure where the cutoff was. MPC's show the 9N-10850-B unit being used up thru 1952. Now, there are some other subtle differences. I have some ammeters with the word 'AMP' on the lower bottom face plate and the needle protrudes from a half moon window about 1/3rd the way up. I have had and seen some ammeters mostly on later 8N models, with the word "AMMETER" and the needle protrudes from a smaller hole nearer the bottom. Again. I can't tell you when or why, but I would think it is just likely a different supplier. I have never seen nor heard of any aftermarket company producing a LOOP style ammeter. Someone once posted of a 30 amp gauge that had a chrome bezel yet the four screw posts like the 20 amp style. I think it was suggested that it wasn't made for the 9N tractor. I had a picture and you could see the mfg TM, Stewart-Warner, etched on the back. So, I have to think it could have been a transitional piece.

    Tim Daley(MI)

    Tim Daley(MI)    Posted 04-30-2018 at 14:54:01 [URL] [DELETE]        [Reply] [No Email]  
  • MORE INFO
  • I forgot about the different scales used on them too. Note the two styles, AMP and AMMETER both Loop 30/30 style but with different graphic scales. Brass would have been a metal in high demand during the war years, but Ford was not in any commercial production for most of 1942 and a month or two into 1943. All materials and production was deemed for war ordnance products only.

    Tim Daley(MI)

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