Cadillac Owners Forum banner

1 - 15 of 15 Posts

·
2000 DTS
Joined
·
10 Posts
Discussion Starter #1
The last 3 times we hoisted the 2000 DTS on the lift to do drive axles and cam cover gasket, when we dropped it back on the ground it had a "dead battery".
We had to jump ti to start it.
What going on????
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,254 Posts
The last 3 times we hoisted the 2000 DTS on the lift to do drive axles and cam cover gasket, when we dropped it back on the ground it had a "dead battery".
We had to jump ti to start it.
What going on????
==========================
you sure don't give us much to go on -
couple questions immediately come to mind -

was the ignition left ON when the car was being worked on -

how long was the car up on the hoist -

did the car fire right up with the jump -

has it EVER needed a jump other then these times on the hoist -

NOTE:
car batteries are designed to give a SHORT - SUDDEN - blast of power to start the engine -
draining a car battery down to the point of requiring a jump WILL "hurt" the battery ans shorten its life -

ALSO - relaying on the car's alternator to fully charge a drained battery puts a LOT of strain on it -
replacing the alternator is NOT a fun - easy task -

-----------------------

where to begin?
I recommend having the battery LOAD TESTED -
 

·
2000 DTS
Joined
·
10 Posts
Discussion Starter #4
==========================
you sure don't give us much to go on -
couple questions immediately come to mind -

was the ignition left ON when the car was being worked on -

how long was the car up on the hoist -

did the car fire right up with the jump -

has it EVER needed a jump other then these times on the hoist -

NOTE:
car batteries are designed to give a SHORT - SUDDEN - blast of power to start the engine -
draining a car battery down to the point of requiring a jump WILL "hurt" the battery ans shorten its life -

ALSO - relaying on the car's alternator to fully charge a drained battery puts a LOT of strain on it -
replacing the alternator is NOT a fun - easy task -

-----------------------

where to begin?
I recommend having the battery LOAD TESTED -
ignition off, doors closed.
car on hoist 5, 4 and 6 hours each time
fired right off.
never needed a jump before.
alt. working, shows 14.3 volts running
 

·
Registered
Eldorado and DeVille
Joined
·
27 Posts
If Battery is fully charged and still have-too jump start DTS, check positive battery cable for resistance if good replace Stater.
 

·
2000 DTS
Joined
·
10 Posts
Discussion Starter #7
How old is your battery?

2 years old and terminals are clean.
Car never has any electrical problems (except drivers seat heater), cranks fast and has bright lights.

Please keep the questions coming,,,I appreciate your time.
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,254 Posts
OK - when you say the battery goes dead and needs a jump to start -
IS the battery actually discharged?
did you/someone check the voltage?
OR did you/someone just assume the battery was dead and jumped it?

might NOT even be a battery issue -
BUT - I would still have the battery load tested -

could be a loose/dirty ground problem between the engine and firewall -
my theory is the car flexes as it's lifted - and flexes again when it's back on the floor -
 

·
2000 DTS
Joined
·
10 Posts
Discussion Starter #9
OK - when you say the battery goes dead and needs a jump to start -
IS the battery actually discharged?
did you/someone check the voltage?
OR did you/someone just assume the battery was dead and jumped it?

might NOT even be a battery issue -
BUT - I would still have the battery load tested -

could be a loose/dirty ground problem between the engine and firewall -
my theory is the car flexes as it's lifted - and flexes again when it's back on the floor -

We tested the voltage the first two times this happened. Time 1 was 3.7 volts, time 2 was 4.3 volts. at the "jump" connection under the right side hood. We didn't bother the third time.

This has really stumped me. I've been wrenching for 50 years. Built 3 kit cars, did 5 frame-off pre-fourties cars, built 3 full out SCCA race cars, was a crew chief for 2 Formula Fords, and repaired more cars than my back wants to remember

Is there something in the anti-thieft system I don't know about?
 

·
Super Moderator
White Diamond '03 DHS (with DTS floor shift)
Joined
·
86,781 Posts
Time 1 was 3.7 volts, time 2 was 4.3 volts. at the "jump" connection under the right side hood.
That is deader than dead. My guess is that battery is toast. Swap in a known good battery and see what happens.
 

·
Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
·
19,254 Posts
That is deader than dead. My guess is that battery is toast. Swap in a known good battery and see what happens.
===================
YUP - probably a broken plate inside the battery - shorting itself out -
 

·
Registered
Eldorado and DeVille
Joined
·
27 Posts
If the Battery is two years old; swap it out under warranty. Good luck on finding the problem.
 

·
Registered
Joined
·
4,153 Posts
If the key is left on ACC (with PRND321 on the IPC and the headunit powered on with a clock display) it drains the battery. Several hours might still be fine with an otherwise healthy battery, but sounds like your battery is weak to start with, then leaving it like that would drain the battery quick.
 

·
2000 DTS
Joined
·
10 Posts
Discussion Starter #14
If the key is left on ACC (with PRND321 on the IPC and the headunit powered on with a clock display) it drains the battery. Several hours might still be fine with an otherwise healthy battery, but sounds like your battery is weak to start with, then leaving it like that would drain the battery quick.

You are correct,and the solver of the mystery. I good friend of mine who is an instructor for GM Corp. service div. tells me that if you leave in the key in the ignition and leave it in anything other than park, all things continue in readiness, thereby draining a good battery within 5 hours. The only way to get the car to go to "sleep" is to place it in park with the key out of the ignition.
I thank all of you who responded with their input and their time.
 

·
Registered
Alexandra - 96 SDV Clyde - 15 Silvy
Joined
·
6,394 Posts
Thank you for reporting back with the final solution. Will keep that in mind going forward
 
1 - 15 of 15 Posts
Top