[rowdyroedel]

Recently purchased an 06 DTS Performance. About a week ago, noticed voltage was reading higher than usual, charging at 15.0-15.1. Within a day or two, the battery was dead. Took a jump easily and on short trips there was no issue other than the voltage reading pegged at 15.0+.

Overnight, the battery would drain and need a jump in the morning. Replaced the battery and it ran high (15.0) for a day and then seemed to settle in around 14.4 which I consider normal. This morning, second day with new battery it is charging again at 15.0-15.1.

Upon start up, it reads around 14.0 and gradually works its way up to 15 volts. I would think it would be the other way around...after start up, it would charge at a higher rate to bring the battery to normal level and then gradually decrease to the low 14 volt reading.

I can assume I have a drain/short somewhere but is this a normal reading for the voltage?

 

[grullon10]

Thats normal read the manual the battery

 

[Superjim]

15.0 and 15.1 IS NOT normal...
I have owned 3 DTS's, starting with a brand new 2006 Performance in Sept 2005...
A year later my garage caught on fire and I replaced it with another brand new Performance... traded that one a few months ago for a 2011 Platinum

None of them have ever charged more than 14.8 and that was right after it starts... after it run a bit all 3 of them would stay around 14.2 to 14.4... On a long multi hour highway run, I have seen it as low as 13.6

 

[grullon10]

Jim I also have 11 base i just ran it for 10 minutes and it stay all time between 14.9 to 15.1 . Nowbthe out side temperature is 16 degree in new York

 

[Superjim]

Jim I also have 11 base i just ran it for 10 minutes and it stay all time between 14.9 to 15.1 . Nowbthe out side temperature is 16 degree in new York

I watched mine closely yesterday every time I drove it (4 times)and it was never above 14.4... I have a 2011 Platinum and it was in the lower 30's here.

 

[Dave NYC]

Sometimes it can be like trying to find a needle in a haystack when you have a parasitic drain. So, when you wake up to drive your Caddy and the battery is completely dead or it does not have enough juice to start the car, it can be upsetting and a start for a bad day (I mentioned this device on a similar thread).

I looked for the drain, I pulled every fuse and I noticed a drop or increase when some fuses were pulled. So, it seemed there could have been more than one problem causing the drain. Before I spent any real money trying to fix it, I purchased something called Priority Start! It's perfect for any car owner weather you have a drain or not.

What it does is, you connect it to the battery and once the battery goes to 11.7 volts, the Priority Start disengages the battery from the car. This way you save your battery's juice until it's time to start it up. To reengage the battery to your car, all you have to do is tap on the break pedal or turn on your dome lights and it reconnects to your car. Being all the info, like your preset radio stations and your car's OBD II info is powered by RAM (random access memory), you won't lose your settings.

This device is also good if you are storing or not going to start your car up for 2 weeks or more. In fact, every car should have something like this to prevent any types of drains. I've been using mine since the summer and it has worked like a champ.

Here's what it looks like, takes a few minutes to install and it's easy to store next to your battery that's under your back seat, it works on side attaching batteries (like on the DTS) or top attaching batteries.

You can find this device and read more about it on this link below, you can also get it via Amazon... It's a good fail safe,

http://www.batterymart.com/p-prioritystart-12-volt-promax.html

 

[CadillacLuke24]

Concerning the voltage, I am no mechanic, but I would take it to a parts store to test the alternator. The voltage regulator may be going out.