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Generator warning light necessary ? #374200
08/22/16 06:25 PM
08/22/16 06:25 PM
Joined: Nov 2013
Posts: 54
Germany
3
37Freak Offline OP
Shade Tree Mechanic
37Freak  Offline OP
Shade Tree Mechanic
3
Joined: Nov 2013
Posts: 54
Germany
Hi!
My 37 Master is converted to 12V with a 1956 Chevy generator (12V;30Amps).
In the 1956 wiring plan a generator warning (idiot) light is shown.
Is this light necessary?
Old Bosch systems in my 30s and 50s Motorcycles need this light.
To get the Bosch generator going, a tiny field current must be supplied. This current is initially provided by the warning light. With the Ignition switch closed, current flows thru the lamp to the regulator and into the field winding. If the dash warning light is burned out or disconnected, the generator probably won't begin charging.
Maybe Delco 6V and 12V generators are better self-exciting at start-up then Bosch stuff. crazy

Thank you!
Tino

Vintage Auto Garage - 12 Volt
Re: Generator warning light necessary ? [Re: 37Freak] #374230
08/23/16 08:47 AM
08/23/16 08:47 AM
Joined: May 2002
Posts: 4,209
Goulburn Australia
tonyw Offline

ChatMaster - 4,000
tonyw  Offline

ChatMaster - 4,000
Joined: May 2002
Posts: 4,209
Goulburn Australia
I have always found the idiot light is required on all systems to supply the field windings. This applies to alternators as well.
Tony


1938 1/2 ton Hope to drive it before I retire
Re: Generator warning light necessary ? [Re: tonyw] #374427
08/27/16 01:52 PM
08/27/16 01:52 PM
Joined: Nov 2013
Posts: 54
Germany
3
37Freak Offline OP
Shade Tree Mechanic
37Freak  Offline OP
Shade Tree Mechanic
3
Joined: Nov 2013
Posts: 54
Germany
Thank you!
Is a 12V 2W bulb ok?

Tino

Re: Generator warning light necessary ? [Re: 37Freak] #374468
08/28/16 09:40 AM
08/28/16 09:40 AM
Joined: May 2002
Posts: 4,209
Goulburn Australia
tonyw Offline

ChatMaster - 4,000
tonyw  Offline

ChatMaster - 4,000
Joined: May 2002
Posts: 4,209
Goulburn Australia
You need a standard type globe (not LED) and I would think a 2w would be very close to requirement, it only allows a small current to the generator field.
Tony


1938 1/2 ton Hope to drive it before I retire
Re: Generator warning light necessary ? [Re: 37Freak] #376023
09/26/16 02:59 PM
09/26/16 02:59 PM
Joined: Jul 2009
Posts: 158
south africa
W
wannchev Offline
Shade Tree Mechanic
wannchev  Offline
Shade Tree Mechanic
W
Joined: Jul 2009
Posts: 158
south africa
The warning light on generator systems is connected between the ignition switch and the armature terminal. When the gen is stationary juice flows from the ignition switch thro the lamp to the armature, being stationary it develops zero volts and current flows thru it to earth lighting the lamp.As it slowly revs up with the engine the voltage slowly rises and the lamp goes out.

Re: Generator warning light necessary ? [Re: wannchev] #401573
01/11/18 02:01 PM
01/11/18 02:01 PM
Joined: Jan 2013
Posts: 107
Adelaide , South Australia
4
47Aero Offline
Shade Tree Mechanic
47Aero  Offline
Shade Tree Mechanic
4
Joined: Jan 2013
Posts: 107
Adelaide , South Australia
You can substitute a resistor in place of the lamp (72 ohms , 2watts), and if you can ,mount it near the alternator,

Last edited by 47Aero; 01/11/18 02:01 PM.
Re: Generator warning light necessary ? [Re: 47Aero] #402214
01/23/18 09:54 AM
01/23/18 09:54 AM
Joined: Nov 2013
Posts: 54
Germany
3
37Freak Offline OP
Shade Tree Mechanic
37Freak  Offline OP
Shade Tree Mechanic
3
Joined: Nov 2013
Posts: 54
Germany
At least, this is what I did.

http://www.lt-forum.de/dokuwiki/lib/exe/fetch.php?w=500&tok=06a77a&media=start:aus_umbauanleitungen:led-cockpit:led-anschluss_im_kfz-schema-ladekontrolle.jpg

Tino


Moderated by  AntiqueMechanic, d2d2 

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