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Re: 2002 Chevy Blazer
You could be draining the alternator and battery with the new stereo..depending on how you hooked it up you might try charging the battery back up.you were supposed to take off the pos cable not the negative
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Here is how to detect a drain in system! Use a test light, Hook up test light to the negative terminal on battery. ( unhook terminal first.) connect opposite end of test light to negative on battery. If a drain, light will be on. Start pulling fuses from fuse box. when the test light goes out, that is the problem curcuit. let sit 3to5 minutes before pulling fuses. Good-Day!
Start by cleaning the battery terminals with baking soda. Start with the negative, then positive. Then reconnect the positive and then negative. If you can remove the battery vent caps check for low acid level. Fill with distilled water if low.
Try this. Take a positive battery jumper cable and hook it directly to the big lug terminal on the starter solenoid that the cable hooks to from the battery. Take the negative jumper cable and hook it to a good steel, iron, or aluminum ground connection right by the starter, on the motor. Now try the key to start it. If it still says nothing, I'm thinking you have some wire harnesses unhooked from the rollover. Someone really good could take a little jumper wire and connect the tiny terminal on the starter solenoid (which goes to the key switch), to the positive battery cable, and that should make the starter work, hopefully. If it cranks with this direct application of power to the starter, be sure and check the "ground straps" between the motor and the frame. I think there are about 3 or 4. Some may have snapped. Be blessed.
Myguess is that you have an electrical short which is causing a drain on the battery. The way to check this is to get a 12 v test light. Unhook the negative side of the battery. Hook the test light up between the negative battery post and the battery cable. If the light comes on, You have a short/drain. To find where the short is, you leave the test light hooked up. Then you start pulling fuses until the light goes out. However, your car stereo needs to be completely unhooked before you do this test because most stereos have a constant electrical source so that the clock stays accurate and the memory stays active so your programed stations don't get lost. GOOD LUCK> Keith Lewis-Dayton,Wa.
if you have an volt meter capable of reading amperage you can check for a draw fairly easily.
Turn off the vehicle, remove the key, unplug any accessories from the 12 volt (cigarette) outlets, and disable the under hood light if equipped.
Disconnect the negative battery cable from the battery. Install your amp meter in series, one lead on the negative terminal of the battery and one lead on the negative terminal of the battery cable. You should see less than .050 amps. It may take up to 20 minutes for everything to power down so don't worry if you see more right away.
If after 20 minutes it does not drop lower than .050 amps you have a draw. You can start removing fuses from the underhood fuse block one at a time. If the draw goes away than you have just narrowed down the possibilities to that circuit. Post what fuse you pulled and I can help you further.
If none of those fuses cancel the draw remove one of the test leads. Open the drivers front door and remove the courtesy lamp fuse from the instrument panel fuse block located behind the access panel on the end of the left side of the dash. Reinstall test leads and then start removing those fuses one at a time.
Some common draws are aftermarket stereos, glove box lights, visor mirror lights,
Re-check battery terminal and make syre they are tight and making good contact, check for corrosion and remover all if ther is any. Check main battery fuse and make sure it good. Check battery cables and ground wires. Good Luck