Mr. Kilmer... I have a 2004 Chevrolet regular cab, 2 wheel drive, automatic transmission, 1500 Silverado pickup truck with 175,445 miles. It's a Florida vehicle since new. Acquired vehicle from family member. Installed a quick disconnect on negative side of battery to keep from draining battery when it sets during winter months and not driven.
Battery is 3 years old. Vehicle never involved in an accident. Have been driving on a regular basis, several times per week. Last week for first time, attempted to start, but no reaction from starter nor any clicking noise from selinoid. I disconnect and then reconnected the quick disconnect on the battery. Vehicle started first try. It now occures every time I try to start it and the disconnecting and reconnecting of the battery allows it to start. I don't own a scan tool. Battery, starter, ignition switch.....? I understand my first problem is owning a 2004 Chevy Pickup.... Why does interrupting the power allow it to start.
It sounds like there is a connection problem involving the quick disconnect switch. I would remove and clean it and reconnect everything cleaned and tightened.
Rather than just disconnecting the battery, put a trickle charger on it.
Lead-acid batteries will self-discharge whether they are connected or not. Sometimes even 1% per day, and they get worse with age. When they get below 75% they grow sulphate crystals which damage the battery permanently.
I would have the battery tested.
