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Old 07-17-2019, 04:25 PM   #1
jim1932
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Default Generator connection off?

My 32 B has been running great and no issues. The prior owner has the battery mounted on the firewall. I removed the battery tray moved the battery under the floor and put on new battery cables. The car starts and runs well but the battery is not charging. Only thing I can think of is the cable from the generator to the starter not making good contact? The only related change was the replacing the battery cable to the starter.
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Old 07-17-2019, 08:47 PM   #2
Terry,OH
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Default Re: Generator connection off?

At the point where the battery negative cable is connected on the starter switch should also be a yellow wire to the ammeter. Do you have the wiring diagram?? Without a connection to the battery the car ignition should not work and car would not start. I suspect the battery may be connected properly but the generator output through the yellow/black wire to the ammeter may be open circuit. Does the ammeter show a constant discharge when the car is running?
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Old 07-19-2019, 06:41 AM   #3
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Default Re: Generator connection off?

yes, it is showing 0 or a discharge.
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Old 07-19-2019, 07:40 AM   #4
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Default Re: Generator connection off?

Jim,


Is your starter switch the early one mounted on the starter motor or the late switch mounted on the steering gear box? I ask as the wiring is different depending on the starter switch location.
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Old 07-19-2019, 09:41 AM   #5
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Default Re: Generator connection off?

Here is one set of the diagrams. Looks to be starter mounted switch. Would appear to me it about has to be the generator not functioning properly or the wiring between the generator and the ammeter has an issue. If it is wired per this diagram you could place a jumper across the ammeter and elemi ate any problem there. But if the ignition and lights are working that is most likely not an issue. From your original post it appears your car may be wired differently than this set of diagrams.
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File Type: jpg 32 4 cyl early.jpg (74.6 KB, 27 views)
File Type: jpg 32 4 cyl 2.jpg (105.6 KB, 10 views)

Last edited by JSeery; 07-19-2019 at 09:52 AM.
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Old 07-19-2019, 10:38 AM   #6
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Default Re: Generator connection off?

Since the ammeter shows zero or slight discharge and the car starts it confirms the problem is the generator, cutout or the generator wire to the ammeter may also be the generator ground through it's mounting brackets. If you have a jumper wire you can connect from a good ground to the generator body if it starts to charge the generator grounding is the problem. If not remove the jumper from generator and ground then jumper the cutout while engine is running, if it starts to charge the cut out is bad remove the jumper and then turn off the engine.

Last edited by Terry,OH; 07-20-2019 at 05:34 AM.
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Old 07-19-2019, 11:51 AM   #7
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Default Re: Generator connection off?

Quote:
Originally Posted by DavidG View Post
Jim,


Is your starter switch the early one mounted on the starter motor or the late switch mounted on the steering gear box? I ask as the wiring is different depending on the starter switch location.
I am not sure what you are asking. The coupe is a model B. It has the pull knob on on the steering column and the lever/switch on the starter.

Of course something may have worn out, but the only thing I did was change the battery cables. I may have them out of order, or may need to clean contacts. I will try that, I also has pretty weak headlights..... may need more ground.
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Old 07-19-2019, 12:05 PM   #8
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Default Re: Generator connection off?

Given that all you did was to change the battery cables, I suspect the polarity of battery cables may be reversed. Switch them 180 and see what happens....
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Old 07-19-2019, 12:39 PM   #9
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Default Re: Generator connection off?

Jim,

While the cable-operated starter switch is the most common variety encountered in Model Bs such as yours, late production Bs use the V8 starter switch with its floor-mounted push rod. The starter motor was revised as was the main wiring harness to accommodate the change.

JSeery has provided the correct wiring diagram for your coupe. The attached photo may be of some help along with that wiring diagram.

The comment above about the generator grounding to the intake manifold applies to V8s, not to fours as the two are on opposite sides of the engine.
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Old 07-20-2019, 05:36 AM   #10
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Default Re: Generator connection off?

David is correct I have corrected my post above, to remove reference to the generator grounding through intake manifold, since that is a V8 issue and not 4 Cyl.

Last edited by Terry,OH; 07-20-2019 at 05:41 AM.
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Old 07-22-2019, 06:16 AM   #11
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Default Re: Generator connection off?

Photos, Anyone see anything not right?
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File Type: jpg IMG_1784.jpg (34.9 KB, 35 views)
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File Type: jpg IMG_1786.jpg (28.9 KB, 34 views)
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Old 07-22-2019, 08:08 AM   #12
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Default Re: Generator connection off?

Does your car have a fuse for the lighting system? It should be mounted under the dash on the drivers side support panel (I believe like the V8). Does your horn work? It appears some early cars did not have the fuse and when the fuse was added in production the wiring also changed (Ammeter, Horn etc.). The diagram in post #5 above is for a car without the fuse. Your photos show a lot of previous repairs on very old wiring. When I see plastic insulated wire terminations I am always leery of bad connections due to the use of improper crimpers and the insulated terminations are never soldered because that would melt the plastic insulation. Often replacing wire terminations makes the wire short and short wires place additional stress on the termination connections to the wire, this results in wires breaking at the terminations.
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Old 07-22-2019, 08:20 AM   #13
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Default Re: Generator connection off?

Apart from the obvious incorrect routing of the negative battery cable (you risk interference with the brake and/or clutch pedal) and some iffy connections (at the ammeter and ignition switch), the wiring harness (not really a harness, but rather a bunch of individual wires of various gauges and apparent ages) appears to be homemade and long past its "best by" date. If it were mine, I'd replace all of it with a proper replacement harness, such as one from Rhode Island Wiring.


Terry,

The fuse block was added when the starter and switch were changed.
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Old 07-22-2019, 11:17 AM   #14
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Default Re: Generator connection off?

the wiring harness is on the list to replace. I think I still have one of Tyree's that came with the car.
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Old 07-22-2019, 11:22 AM   #15
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Default Re: Generator connection off?

Also, the long bolt mounting the starter was from when the battery was under the hood. As I recall the ground goes to one of the transmission bolts.
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Old 07-22-2019, 01:49 PM   #16
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Default Re: Generator connection off?

From what David just posted #13 your car should not have the lighting fuse. So the schematic diagram JSerry #5 is correct your car. I can't think of a better time to replace the wiring harness. Tyree makes a very good harness. Make sure the harness you have is correct for your car, before you start.
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