Troubles
If on turning on the alternating-current switch the bulb does not glow:
See whether the alternating-current supply is on.
Examine the supply line fuses. If these are blown, or are defective, replace them with 15 ampere fuses for a 115-volt line or with 10-ampere fuses for a 220-volt line.
Make sure that the bulb is screwed well into the socket.
Examine the contacts inside the socket. If they are tarnished or dirty, clean them with sandpaper.
Try a new bulb, Cat. No. 189049. The old bulb may be defective.
If the bulb lights but no current shows on the ammeter:
Examine the connections to the batteries, and also the connections between them. Most troubles are caused by imperfect battery connections.
Examine the fuses inside the case. If these are blown or are defective, replace them with 15 ampere fuses, Cat. No. 6335.
See that the clip is on the wire of the bulb.
The bulb may have a slow leak and not rectify. Try a new bulb, Cat. No. 189049.
Have the switch arm make good contact on the regulating switch.
If the current on the ammeter is high and cannot be reduced:
The ammeter pointer may be sticking; tap it lightly with the hand. The ammeter will not indicate the current correctly if the pointer is not on the zero line when the Tungar is not operating. The pointer may be easily reset by turning slightly the screw on the lower part of the instrument.
Be sure that the batteries are not connected with reversed polarity.
The alternating-current supply may be abnormally high. If only one three-cell battery is being charged, and the alternating-current supply is slightly high, then the current on the ammeter may be high. The simplest remedy is to connect in another battery or a small amount of resistance.
A spare bulb should always be kept on hand and should be tested for at least one complete charge before being placed in reserve. All Tungar bulbs are made as nearly perfect as possible, but occasionally one is damaged in shipment. It may look perfect and yet not operate. For this reason all bulbs should be tried out on receipt. If any bulb is found defective, the tag which accompanies it should be filled out, and bulb and tag should be returned to your dealer or to the nearest office of the General Electric Company, transportation prepaid.