| totalchefen | -- 07-07-2010 @ 5:37 AM |
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problems with charging. I do not get my 1940 Ford generator to load. bought a new generator from usa 11T10000 Does anyone have a wiring diagram to help solve this Ps After all help earlier from you my fire truck run well with good brakes. The last problem its the charging and window glass in the left door on the truck. How to replace it ? Best Regards Lars.andersson@ahlsell.se
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| TomO | -- 07-07-2010 @ 7:19 AM |
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Here is a link to the wiring diagrams and schematics for Fords. Your fire truck should have the same wiring diagram as the car. You may have to "polarize" your generator. Make sure that your truck battery has the POS terminal grounded. Then remove the field wire from the voltage regulator and touch it to the BAT terminal of the regulator. Then disconnect your battery and reconnect the field wire. Your generator should now charge. Tom
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| supereal | -- 07-07-2010 @ 10:23 AM |
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If Tom's suggestions don't restore the charging circuit, follow the wiring back from the generator to the battery. We have worked on several old firetrucks, and often their wiring has been heavily modified when the apparatus was installed. Also, be sure that there is a ground strap between the engine and the place on the body where the battery ground is attached. Some generators also have a ground terminal that needs to be connected.
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| TomO | -- 07-08-2010 @ 7:02 AM |
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Lars, I am sorry that I did not paste the link in my previous post. Here it is http://www.vanpeltsales.com/FH_web/flathead_drawings_electrical.htm Here is a link to window glass installation. Your truck will be different from the car, but the same principals apply. http://www.vanpeltsales.com/FH_web/flathead_drawings_body.htm Tom
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| totalchefen | -- 07-09-2010 @ 6:38 AM |
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hey have tested as you tell me about but can not see any difference. how you see it? measure the voltage? how to try out if charge relay works?
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| alanwoodieman | -- 07-09-2010 @ 7:29 AM |
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measure voltage at the battery, 6 volt battery will be 6.45 volts with the engine OFF, start engine and check again, should go to 7 volts or close to it, I finally set mine at 7.42 volts, enought to recharge the battery and run the lights-heater-radio without discharging the battery. If you do not have this voltage, check the armature volts with the engine running-big wire post on rear of generator-should be around 8 volts, if you have this then voltage regulator is bad. Remember this is a positive ground system
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| TomO | -- 07-09-2010 @ 7:32 AM |
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You can test it by measuring the voltage at the BATT terminal on the voltage regulator. It should read between 7.2-7.4 volts when the engine is running at 1500 rpm. To check if your problem is the voltage regulator or the generator, jumper the FIELD terminal to the ARM terminal for a short period while measuring the voltage at the BAT terminal. If the voltage goes to 7.2 volts, your generator is OK. Make sure that you have the generator wired correctly. The ARM wire should be on the back of the generator and the Field wire should be connected to the terminal on the side of the generator. If your generator has 2 terminals on the side, one is the field and the other is the ground. The field terminal is usually marked. Tom
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| supereal | -- 07-09-2010 @ 10:05 AM |
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Some of the firetrucks we have worked on used a special high output generator to sustain emergency lighting, requiring a unique voltage regulator. They used a dropping resistor to protect the ammeter. Usually the charging path runs thru the ammeter, but when modified, a "sampling" circuit was used instead. and often a remote ammeter was present on the pump control panel. Are you sure the new generator isn't charging and just not showing up on the dash? A voltmeter across the battery will confirm whether you have input if it shows 7 volts or more with the engine running. If you didn't replace the existing regulator, either do so, or substitute a known good unit.
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| 37RAGTOPMAN | -- 07-10-2010 @ 7:22 AM |
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You can also check the generator by taking the wire off of it,[ ENGINE OFF ] put a voltmeter to the ARM post, the large one,take a jumper lead to the small post FIELD TERMINAL.., and while the engine is running, just ground the wire for a few seconds like 3-4 and see if the voltmeter jumps up to aroud 8 volts. if it does you reg is not working and generator is fine, hope this helps 37RAGTOPMAN KEEP ON TRUCKIN,,,
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| TomO | -- 07-19-2010 @ 6:51 PM |
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Lars, you said that you fixed your charging problem. Will you please post the solution here, it will help us when someone else has a problem. Tom
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