1998 Durango 5.2l v8 won't start but battery good?
This one is a puzzler...
On a few occasions now my wife's Durango would not start. On both occasions a jump start got it going again.
On the first occasion I checked the car in the garage, the battery voltage was 12.6. But none of the gauges or idiot lights came on when the key was turned. There were no relays on solenoids clicking. Nothing the car behaved as if there were no battery, tried the interior lights and headlights ... nada.
Switched the battery charger to its 225Amp jump start setting and it the gauges came on , the lights lit and the car started. Left the battery on trickle charge for 90 mins at 2Amps and the car started and ran fine for the next five days.
Second time, was exactly as before the car was jump started and we got it home.
Again checked the battery voltage and it was 12.6, turned the key without trying to crank it, and noticed that in the second position the battery voltage dropped to about 3.5V so no wonder nothing was happening. Switched off and back to 12.6 again. Once again no headlights.
Decided to take the battery out to inspect it, wiped it over checked fluid levels, everything as good. Put it back in and this time the gauges came on and the lights lit up and the car started.
All of which makes me think the battery is fine. Any ideas? All I can think of i that there is some sticky relay or solenoid, but could this cause the voltage to drop to 3.5, I don't think so. Could there be bits of plate on the bottom of the battery causing an internal short, that resolved itself when the battery was lifted out.
Thanks in advance