Testing The Charging System - Westfalia 15 30 15 Original Instruction Manual

4. Now compare the previously noted value form the battery load test (LOAD
VOLTS) with the voltage value of the starter test (MIN, CRANK VOLTS) and
check with the aid of the table (A).
LOAD VOLTS
MIN, CRANK VOLTS
If the value for MIN, CRANK VOLTS substantially differs from the table, the
starter motor might be defective or there is bad cable connection e. g. at the
transmission resistance or the battery is under-sized, i.e. too small for the engine.
Example: First measuring value shows 10.4 V for load volts and second voltage
value for min. crank volts drops to 9.5 V. According to the table the min crank volt
can drop up to 8.2 V and is still acceptable. If the voltage value for min crank volts
is below 8.2 V, this might be a sign for too much current consumption.
Testing the Charging System (Test the Alternator)
With this measurement you can test the charging system of your vehicle.
Continuous charging or permanent discharging of a battery might lead to damage
the battery. First undertake a battery load test and if the capacity of the battery is
sufficient, undertake the charging system test.
The charging system is tested with the engine running. The engine should run to
operating temperature.
 Stay away from moving and rotating parts and make sure jewellery, clothing
and hair cannot become caught; there is a danger of injury.
 Please also keep in mind that the engine compartment contains hot parts.
a) Connect the black clamp (3) to the negative terminal (NEG, N, -) of the battery
and the red clamp (1) to the positive terminal (POS, P, +) of the battery.
b) For the test, run the engine at a moderate speed (between 1200 and
1500 rpm).
c) DO NOT press the testing switch, but only check the voltage value from the
voltmeter (7). At the right end of the scale there is a sector labelled "Charging
System" (E).
If the charging system is in good condition, the needle should be in the green
area of this sector and remain stable.
Operation
10.2 10.4
7.7 8.2
19
10.6 10.8
8.7 9.2
11.0 11.2
9.7 10.2
11.4
10.6