AfterMarketNews Auto Care Pro AutoProJobs Auto-Video.com Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service

Home Technical Topics Tech Videos

Parasitic drains can be measured with ammeters with the battery cable. Now the problem with taking the battery cable off to install the ammeter is that, sometimes electronic modules are the source of the parasitic draw. In this technical tip clip instructor Dave Hobbs talks about some other tricks for diagnosing these problems. He talks about the class two message monitor– a feature available on the Tech Two and also the Master Tech– it basically tells which module’s active and which module is inactive. He also goes on to cover using a parasitic draw tool in order to not disrupt the circuit while using an ammeter. Watch this clip to learn how to use the class two message monitor and or a simple knife switch that can actually be used for some neat tricks in diagnosing some stubborn, hard to find, parasitic battery drains.


Similar articles
TPMS, Wake Up, Karl, Batties
0 14990

To conserve battery power, these sensors basically “go to sleep”. Karl will cover how to wake them up and...
TPMS, TechTip, Law
0 16711

If a vehicle comes into your shop with the TMPS light on and you attempt to fix it, the...
Brakes, Boiling Fluid
0 14834

Mark DeKoster gives you a few tips on to how remove or replace flex lines using a torch to...
Pascal's Law, Brakes, Karl
0 14810

Think you’re an expert on hydraulic principles? Did you know that by changing the size of the output piston...

Leave a Reply

Powered by AVI

TPMS, Wake Up, Karl, Batties
0 14990

To conserve battery power, these sensors basically “go to sleep”. Karl will cover how to wake them up and...
TPMS, TechTip, Law
0 16711

If a vehicle comes into your shop with the TMPS light on and you attempt to fix it, the...

Take a Quick Quiz

Making Money with TPMS, Quick Quiz
0 14807

If a vehicle leaves your shop with the TPMS light on or flashing, you could be fined...
ASE-A5, Quick Quiz
0 14864

Automotive Video's ASE test prep videos have everything technicians need to know to be ASE Certified. Presented...