Skip the auto shop - Our mechanics make house calls

Q: How to tighten battery connectors

asked by on

My back car lights were on and I couldn't figure out why I didn't know if it was the break lights or what. Later that day my battery died and my granddad said he loosened my battery poles so it wouldn't drain my battery (this was the next day) and I said it was already dead so now I need to know how to tighten the connectors back so I can charge my battery. Please help
My car has an automatic transmission.

Hello. Bolting connectors back on can be dangerous if you are not clear on how to do this. If you do not understand the mechanical (bolt on) connection between your cars electrical wiring to the battery terminals, for your own safety do not attempt to make adjustments or connections there. The reason is if you mistakenly short circuit anything in the vicinity of the battery, worst of all if you short circuit the top (or side) post connectors, the battery could explode leading to injury. I recommend having an expert properly have this done. An automobile battery is a high energy device containing hundreds of amps of power. All aspects of car maintenance have elements of danger but this is one that can be particularly dangerous if you are unexperienced. The main idea is to open up the clamps using a ratchet, cleaning the terminals, and tightening the clamps on the correct terminals. The most important aspect is making sure the cables are connected at the right cables. Always connect the positive cable first to avoid a short circuit. Again, have someone skilled perform this procedure if you are unsure.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Wont start after leaving the key on all night.

Hi there. Check the battery cables and see if the are tight and clean. A loose battery cable can cause the power to come on but not turn over the starter. If the battery cables are tight, then check the...

Q: I am losing compression, why?

Hi there, thanks for writing in. Dwindling and/or uneven engine cylinder compression is due to valve defects and/or cylinder ring wear. Additional causes are head gasket defects and there is also the possibility that your timing chain has skipped, thus...

Q: Car won't start

You may have gotten a defective starter and would need to have power pumped to the starter to make sure it is getting power from the starter relay. If no power is getting to the starter solenoid from the starter...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...