Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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Joined: Nov 2013
Posts: 54
37Freak Offline OP
Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Nov 2013
Posts: 54
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

Joined: May 2002
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ChatMaster - 6,000
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ChatMaster - 6,000
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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
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Posts: 54
37Freak Offline OP
Shade Tree Mechanic
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Thank you!
Is a 12V 2W bulb ok?

Tino

Joined: May 2002
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ChatMaster - 6,000
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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
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Backyard Mechanic
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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.

Joined: Jan 2013
Posts: 117
Shade Tree Mechanic
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Shade Tree Mechanic
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Posts: 117
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 10:01 AM.
Joined: Nov 2013
Posts: 54
37Freak Offline OP
Shade Tree Mechanic
OP Offline
Shade Tree Mechanic
Joined: Nov 2013
Posts: 54
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


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