Скачать или смотреть Vanagon Voltage drop test of starter ground 1080

This shows how to do a voltage drop test on a Vanagon using a 100A "battery tester" to simulate the (appx 100A) starter amperage load.

This battery tester is very simple and they cost about $30.

This van has a "direct starter ground" modification which bypasses the corroded transmission case, which is the cause of many "slow starters". The direct ground cable shown costs about $20. It's 4 gauge, 16 inches long with a 10mm ring terminal on one end and an 8mm ring terminal on the other end.

If you find more than 0.50 volts "drop", you should fix the problem. If you find more than 1.0volt, your starter will be slower. The ideal repair is to add the direct starter ground (to the chassis, as in the pic) then delete the forward VW strap to isolate the gearbox from any future electrical erosion.

If you find 2 volts, this is due to your gearbox case and bolts corroding. You already know you have starter trouble, AND your gearbox bearings are eroding too, making a pile of black mud on the drain magnet. This black mud is thousands of miles of gearbox life being lost to electrical leakage. Ground your (corroding) gearbox properly to stop this damage.