Battery Hydrometer Displays Dark or Yellow Dot. GMC Truck GMC P42 Commercial Chassis 1998

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 Engine 🢒 Engine Electrical 🢒 Battery Hydrometer Displays Dark or Yellow Dot

The maintenance-free battery has a built-in hydrometer which consists of a ball floating in the electrolyte. The hydrometer is temperature-compensated. The color of the hydrometer indicates the condition of the battery.

•	A green dot appearing on the hydrometer means that the battery is ready for testing.

•	A dark hydrometer with no green visible means that the battery has a low charge. There may be a problem in the charging or electrical systems. Refer to Charging System Check or Battery Electrical Drain/Parasitic Load .

•	A clear or light yellow color means that the battery fluid level is below the bottom of the hydrometer. Replace the battery if the battery condition affects the cranking system. A low fluid level can be caused by any of the following conditions:

-	An excessive charge

-	Tipping the battery

-	A faulty charging system. Refer to Charging System Check .