Q: Q: Battery drainage

asked by on

Within the last 6 months, I have replaced my alternator and all the gearing systems, all of my spark plugs, and my radiator/cooling system, yet something is still draining the battery. Every month or so the battery dies and takes 5-10 minutes to successfully jump start the car (no lights come on at all). However, I hooked it up to a battery charger and charged it to a full charge then ran my car and measured all the voltage differences from different areas which all seemed to be correct. I am wondering if there is another place that I am not thinking of that could be draining the battery. Last night I had it parked for 45 minutes to come back to a completely dead car, but it started on the first try this morning right away and ran great.

My car has 230000 miles.
My car has a manual transmission.

It is possible to have a bad ground or short somewhere. Check the connection at the negative battery cable to the engine/chassis. Remove, clean, and reinstall it. Also check for loose connections/ground at the fuse box.

I owned a Jetta of the same generation - 85-92. A common source of trouble is the fuse box under the drivers side dash getting wet. A common source of water intrusion is around the windshield seal as well as a clogged cowl drain under hood. It can fill with water and come through the firewall through the speedometer cable and other things running through the firewall.

If you need some help with getting this fixed, consider YourMechanic, as one of our mobile technicians can come to your home and diagnose the draining battery firsthand for an accurate repair.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Battery drainage

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: coolant coming out of radiator cap.

Hello. If the engine is overheating then there can be a number of things going on. I usually test the radiator cap, the thermostat, and the cooling fans. Any of these can fail and cause this. If these have been...

Q: Heater control system will not power up even though there is power to it

Hi and thanks for contacting Your Mechanic. When the penny was in the cigarette lighter, the penny act as a conductor and shorted out the circuit. The cigarette lighter is either powered all the time or powered when the ignition...

Q: Grating noise and curved tire - 1972 Volkswagen Super Beetle

The problem sounds like there's an issue with the suspension system. A worn or even broken suspension part can cause a misalignment of the wheel and tire assembly and cause the noise. Have the area inspected by a qualified professional....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...