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Re: Ammeter
#41
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Jimmyk
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Did another test from Autolite where I removed belt from generator and applied battery power to Arm this activated the motor and runs smoothly…with motor operating I then grounded the field terminal ..doing so is supposed to alter the speed of the motor which indicates brushes working..in this video it clearly shows motor speed changing when field is grounded…when I applied ground to field nothing changed at all….this test was easy for me to understand so I tried it…not sure how accurate it is ..

Posted on: 5/23 9:17
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Re: Ammeter
#42
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humanpotatohybrid
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Quote:

Jimmyk wrote:
Ok when ohm testing the reading went up to and stayed at 4.0 from field to ground….then went up to and stayed at 3.3 field to arm…that is with engine off and wires disconnected….would this be correct for the regulator I have now ?


Yes. The field is either internally connected to ground or to arm on the side opposite which is connected to the field terminal. The armature is connected across arm and ground.

Assuming the field is connected to field and arm, the resistance across those terminals will be the field coil resistance. Across field and ground, you are measuring the field and armature in series, so the ohms will be higher. This is what you got, so our assumption is correct.

To check your regulator, ohm between field and ground on it. You should have continuity of less than an ohm. You should have continuity, but a significantly higher value if you press gently on one of the two lower relays to open it. Again this is all on the regulator and disconnect at least the field wire before testing.

The point of this is that a generator whose field is internally connected to the armature must use a regulator that grounds the field connection. The other way is an internally grounded field, and the regulator connects it to the armature to excite it. Ford often used the latter and pretty much everyone else used the former.

This all assumes the equipment is compatible with 6V positive ground and the generator is polarized correctly. When you connected the generator to the battery, did it spin in the same direction as the crankshaft rotation?

Posted on: 5/23 11:22
'55 400. Needs aesthetic parts put back on, and electrical system sorted.
'55 Clipper Deluxe. Engine is stuck-ish.
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Re: Ammeter
#43
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Jimmyk
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Ok well I tried it again now the generator is spinning much faster and when I ground the field it slows down which is what I saw on the video. However, I see very little jump if any in voltage when grounding the field..a couple times there was a quick glimps of a high reading like a blink when I was removing the jumper wire from ground but mostly stayed the same voltage..also I noticed my ammeter was now stuck in the discharge position and after I tapped the glass the needle returned and it looked like that was affecting the power going to generator?? I will attach video…the generator was reading around 5.5 with direct power to it but the battery is getting drained as I’m working on it…maybe goes up to 6 when field grounded tks in advance!

Posted on: 5/23 14:21
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Re: Ammeter
#44
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BDeB
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Quote:

Jimmyk wrote:
I learned now that the generator that was purchased on eBay was originally a 1946 Autolite Gdz-4817a but was rebuilt to a 4801f which is correct for my 41… but I don’t know if this could be related to what’s going on…as far as the wrong regulator or type a or b for testing? I have the brillman regulator which replaces the original vrp-4002-c for the 4801f…..


The GDZ 4817A has the same armature and field coils as the GDZ 4801F so the electrical performance will be correct.
The main difference will be the pulley which should be an SP1296 for the Packard. The number may be stamped on the pulley.

Posted on: 5/23 14:35
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Re: Ammeter
#45
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humanpotatohybrid
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Quote:

Jimmyk wrote:
Ok well I tried it again now the generator is spinning much faster and when I ground the field it slows down which is what I saw on the video. However, I see very little jump if any in voltage when grounding the field..a couple times there was a quick glimps of a high reading like a blink when I was removing the jumper wire from ground but mostly stayed the same voltage..also I noticed my ammeter was now stuck in the discharge position and after I tapped the glass the needle returned and it looked like that was affecting the power going to generator?? I will attach video…the generator was reading around 5.5 with direct power to it but the battery is getting drained as I’m working on it…maybe goes up to 6 when field grounded tks in advance!


Can you post the link to this video?

Posted on: 5/23 14:51
'55 400. Needs aesthetic parts put back on, and electrical system sorted.
'55 Clipper Deluxe. Engine is stuck-ish.
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Re: Ammeter
#46
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Jimmyk
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Ok did resistance test on two lower contacts on regulator and when I opened either of the it raised ohms significantly..was barley any reading and hard to do when closed contacts…it would start at a number and go down to almost 0… I did the resistance on the generator and now it’s closer to the same where fld to arm is 3.6 and to ground is 3.7 or 3.8 ….?but ground is still slightly higher I guess

Posted on: 5/23 15:12
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Re: Ammeter
#47
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Jimmyk
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I tried but it won’t let me post video

Posted on: 5/23 15:14
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Re: Ammeter
#48
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Jimmyk
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Looking From the front of the vehicle looking straight at pulley the generator is spinning to the right..

Posted on: 5/23 15:24
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Re: Ammeter
#49
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Jimmyk
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How much higher should the resistance be?

Posted on: 5/23 15:55
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Re: Ammeter
#50
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humanpotatohybrid
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Looks correct.

Should be very nearly 0 when closed; when open the current instead flows through a resistor. Most use a 5 or 10 ohm or so wire wound, so 3.8 ohms sounds right.

Just post a link to the video. Copy the web address from the address bar and paste it in.

Posted on: 5/23 18:13
'55 400. Needs aesthetic parts put back on, and electrical system sorted.
'55 Clipper Deluxe. Engine is stuck-ish.
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