WHAT SIZE OF BATTERY DO YOU NEED FOR 1994 SL 500

Bad alternator or battery is most likely issue

your vehicle has the sub model number R129 this was used upto 2002 when an updated SL500 was launched with the sub model number R230 it was this model that first had the Electronic Stability Control fitted.Your vehicle does have ABS control on the braking system i hope this is of help to you

Salavage yard but if you dont mind wasting a couple bucks and know the general size you need just go to a part store and buy some that are around the size you need. You can take back the ones that did not fit. You can also go to a gm dealer and buy the correct ones as well.

The car itself is worth 500 dollars if it runs, you are going to spend twice that much converting it. So spend a thousand dollars and buy a 99 saturn with power steering and then sell yours for five hundred. That way you are only out 500 and all of your parts are 5 years newer.

it should be in the boot under the floor ,and if its a petrol version a 74 amp hour battery is sufficient and should cost trade about 60/70 euros and retail about 90/100euros

the battery or which post is which? First, the positive (+) post is ALWAYS larger than the negative (-). The posts are well marked next to each post. If you llok at the terminals, follow which one is connected to the body of the car, thats ALWAYS the negative cable (-)

The dealer can help you with that.

Here are the wire colors and what they do in the system. Please rate my help.

1994 Saturn SL Car Radio Stereo Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue

6 3/4" front and the same for the rear.

yes