b'Method 2: Using a Current PUBLISHED: -6-AUG-2020 Probe and Voltage Dropping2016.0 RANGE ROVER SPORT (LW), 414-00 to Identify Current DrainsBATTERY AND CHARGING SYSTEM - GENERAL INFORMATION The Current Probe PartQUIESCENT DRAIN(G1451124) A far less intrusive way to solve the DESCRIPTION AND OPERATION shunt-meter-fuse-poofmethod ofcurrenttestingistousean VEHICLE QUIECENT CURRENT TEST inductivecurrentprobeanda If a customer complains of a startup batter that discharges continuously or when leftmeterorscopetomonitorthe for a prolonged period of time, it is recommended that a quiescent drain test is donecurrent activity. Hands down, we as described below. prefer the scope method, because thevisualvolt-ampmeterisfar is to cause a pulsation in the measured current drain. In this case, either the average current should be taken (using a digital multimeter with an averaging system) or theadigitalDVOMscreen.Using current reading taken, ignoring the brief high current peaks. ascope,wecanseethewhole Figure 1: Land Rover Bulletin 414.00 discusses testing for parasiticstory all at once. The current, the current drain using the Quiescent Current Test. Land Rovervoltage, the Ohms Law math, and recommends the use of a meter and current probe. OK, but thisthe source voltage. testing method also has some serious challenges to be discussed. However,usingacurrentprobe alsohasacoupleofimportant METHOD OF MEASUREMENT limitations to be aware of. PREPARATION - ALL VEHICLES, USING A DIGITALFirst,these20-60amplowamp MULTIMETER WITH A CURRENT CLAMP probes often dont measure small currents well. Because the current NOTE: clampisinductive,theprobes Do not use an in-line digital multimeter to measure the quiexcent drain on vehiclesjawsmustbeclosedcompletely installed with an electronic throttle. The current exceeds the maximum amount the fuse in the digital multimeter is capable of handling. aroundthewire(s),otherwise, erroneousreadingsareobtained. 1.Second,duringlongtesting (vehicle unlocked and smart key present).2.Remove any other potential electrical drains such as accessories plugged intotimesorovernighttesting,the accessory sockets. inductiveprobetendstogauss 3.Connect the current clamp to the digital multimeter. upmagnetically,andthecurrent 4.Calibrate the current clamp. slowlydriftsthelongeritsits,FOLLOW5.Install the current clamp around the startup battery ground cable.6.Follow the instructions in the "Quiescent Current Test" section in this procedure. providingmisleadingcurrent Figure 2: Land Rover Bulletin 414.00 describes their preferredreadings. We will solve the probeSSF ONcreep issue for longer testing times method of tracing parasitic current drains. here shortly so, hang on! INSTAGRAMThe Voltage Drop PartSecond, in todays vehicles, once the vehicle is fully asleep and you are monitoring quiescent (resting)must be voltage pushing it through a load. Therefore, current only, just pulling the fuse out and replacinganycurrentdrainnomatterhowminutecan itagaintotestifthedraindisappearscanwake up other modules and create situations where thecircuit. By testing for voltage drop across the fuses, technicianneedstowait30moreminutestoputwecandetectthepresenceofthisroguecurrent everything back to sleep to continue testing again.activity nicely. Inaddition,Bulletin414.00alsopointsoutthatOKthen,eachtestingmethodhasitschallenges disconnecting a fuse may reset a stuck relay, therebyand limitations. But what if we combine pieces of unknowingly resetting your fault condition so youllallofthesetestmethodsatthesametime,solveSSFIMPORTEDAUTOPARTSthe testing limitations, and utilize a lab scope and Itisalwaysbesttotestforcurrentdrainswithtesting strategy to monitor, do the math, and help us minimal to no circuit disruption whenever possible. catch our current thief?26'