i hav a 03 avalanche n wen i try 2 start it just clicks but the bat, alt, and starter are good wat could it be

Question

it does it often

Answer 1

corrodedconnections if all you say is true

Answer 2

Two things the first like John St. Louis said. You have no idea the number of times I have ran into that problem. And if left long enough the corrosion corrodes the battery cables into back inside the insulation where you can't see it.

The second thing is the starter solenoid. Contacts in it might be burned or wore out. Either way it is a sealed unit and has to be replaced if that is the case.

Check for:
1. corrosion on battery terminals
while you have terminals off battery:
A. Check battery with a battery tester load tester.. A gird type that will load the battery down. Not just a volt meter. Most parts houses that sell batteries will do that for you if you take the battery in.
B. check each battery cell with a hydrometer for weak cell or dead cell. You can but them at reasonable price at parts houses such as Advantage, O'Reilly's, Auto Zone.
2. take terminals off and clean them to where they make good contact with battery post.
3. check battery cable for corrosion back in insulation
4. check starter solenoid.
A. easy way to check solenoid if you have a set of jumper cables. use one of your jumper cables to jumper out the solenoid.
You do that by clamping one of clamps onto one side of the solenoid and touching the otherside with the other clamp.
That's the two large cables going to your solenoid. But be careful not to damage the threads or you will have heck getting the nut off.
Hope that helps.

Answer 3

See a mechanic-OR:

The 'clicks' only say the solenoid is trying to connect 12V batt to the starter.
To check starter: Touch a jumper cable from the
battery +12V, to the 'heavy' starter wire. ( Beware battery hydrogen gas, giant sparks, and high current ! )
If starter doesn't turn over, see a mechanic.--- If it does, see a mechanic: it might be just the solenoid. Good luck.

Answer 4

if battery is charged to 12.65volts
and the starter is good.
then that only leaves the connections
or the engine i siezed ,

try a jump.
try a diff. battery ( yours could have a cracked internal conn)
spin engine over with a wrench to check of siezed.

if you have volt meter make sure you have 10v at starter
big wire while starter, if not battery is hosed.

DMM CHEEP: digital multimeter (see to 20vdc range)
$2.88 at harbor freight , is amazing what we can do now.

Answer 5

Starter ISN'T good! Worn brushes or a bad spot on the armature. Pull the starter & have it tested, if it draws over 300 amps replace it.

Answer 6

you starter is not engaging the flywheel, this could be because the starter is broke or because your battery is low on juice, try to jump it and see if it makes a difference, or it could be the solenoid

Answer 7

How do you know they are good?
Clean your battery cables and terminals