Reply to "help troubleshoot a starting problem?"

Cable connections are bad
to prove it ... if you have a volt ohm meter first do a voltage check with the car off put the leads on the battery posts then move the volt meter leads to the battery terminals if there is any difference pull them and clean them.

Some people put a very light coat of grease on the terminals to keep the oxidation from happening, I use carbon impregnated grease because it is conductive, but you can use any grease but remember most grease is a di- electric meaning it is an insulator.

Next clip the leads on the battery so you can see them while you try to start the car, best to have someone else to start the car. Then when you crank the car over notice what the voltage drops to.

Next start the car, If it starts then look at what the voltage rises to, as long as it is 1 volt over what it's off state was ( first reading) your OK. Now someone will state 13.7 to 14.5 volts is good they are right while the car is running and at about 1000 rpm. But 1 volt over is good also.

Most likely the battery is low I would pull the terminals clean them and put the battery on a trickle charger, when it is fully charged remove the charger bolt the positive side to the battery then with the car door closed and nothing on in the car have someone turn off the garage lights while you are holding the terminal and know where the post is and touch it to the post and look and see if there is a spark if there is you have a draw on the battery pulling it down, if not you are good to go. PS a security system will show a spark if you have one.
I will help anyone if i have the time and I travel a lot so if you have any questions just pm me take care.