Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
> possible dead battery?, 11.78 V
914 RZ-1
post Jun 10 2018, 09:56 PM
Post #1


Porsche Padawan
**

Group: Members
Posts: 370
Joined: 17-December 14
From: Santa Clarita, CA
Member No.: 18,230
Region Association: Southern California



1. My car has been sitting for awhile, but it has started up when I needed it to.
I recently took out and put back the transmission. I got everything hooked up and the car would not start. I took a reading across the battery terminals and got 11.87 volts. Is this an indication of a dead battery?

2. I should mention that I unhooked the positive and negative terminals while the trans was out. I also have a battery disconnect on the negative terminal (turn a screw to connect/disconnect). I got sparks when I hooked up the positive and touched the wrench to the car accidentally.

3. I have an Optima Red Top battery that is only about 1-2 years old.

4. I checked all the wire connections related to the trans and didn't see anything. That shouldn't matter anyway, I think.

5. I'm thinking of jump-starting the car and seeing if that works.

6. I'm also thinking of getting a battery charger and hooking that up.

Thoughts?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
The Cabinetmaker
post Jun 11 2018, 05:28 AM
Post #2


I drive my car everyday
*****

Group: Members
Posts: 7,698
Joined: 8-May 03
From: Tulsa, Ok.
Member No.: 666



Did you reconnect the ground strap on top of the trans?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914 RZ-1
post Jun 11 2018, 11:36 AM
Post #3


Porsche Padawan
**

Group: Members
Posts: 370
Joined: 17-December 14
From: Santa Clarita, CA
Member No.: 18,230
Region Association: Southern California



I reconnected everything, including the ground strap.

I'm wondering what the correct reading for a good battery should be. I seem to remember reading that anything lower than 12 volts is considered in need of recharging.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SirAndy
post Jun 11 2018, 11:53 AM
Post #4


Resident German
*************************

Group: Admin
Posts: 37,976
Joined: 21-January 03
From: Oakland, Kalifornia
Member No.: 179
Region Association: Northern California



QUOTE(914 RZ-1 @ Jun 11 2018, 10:36 AM) *
I'm wondering what the correct reading for a good battery should be. I seem to remember reading that anything lower than 12 volts is considered in need of recharging.

Without anything drawing from it, the reading should be in the 14v range on a good battery.
However, that can be misleading since it easily can drop and not work correctly when you put load on it, even if it reads high otherwise.

Get a cheap charger and hook it up and see if the battery comes back ...
(IMG:style_emoticons/default/smile.gif)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Chris914n6
post Jun 11 2018, 12:04 PM
Post #5


Bad signals will kill the spark.
***

Group: Members
Posts: 1,909
Joined: 14-March 03
From: Las Vegas, NV
Member No.: 431
Region Association: Southwest Region



A dead cell would make it 10.5v. That just sounds low -- in need of charging.

Optimas hate cheap chargers. Spend the $50+ on a smart charger with trickle.

A battery at rest will hover around 12.5v
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Philip W.
post Jun 11 2018, 12:04 PM
Post #6


Dr. Phil
****

Group: Members
Posts: 3,081
Joined: 9-December 09
From: Bluffton, SC
Member No.: 11,106
Region Association: South East States



the last battery that I had that died read right at 11v, tried charding it and was not able to get it to charge, I believe it had a bad cell -
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Bartlett 914
post Jun 11 2018, 12:48 PM
Post #7


Advanced Member
****

Group: Members
Posts: 2,064
Joined: 30-August 05
From: South Elgin IL
Member No.: 4,707
Region Association: Upper MidWest



QUOTE(Chris914n6 @ Jun 11 2018, 01:04 PM) *

A dead cell would make it 10.5v. That just sounds low -- in need of charging.

Optimas hate cheap chargers. Spend the $50+ on a smart charger with trickle.

A battery at rest will hover around 12.5v

(IMG:style_emoticons/default/agree.gif)
I gave up on Optima batteries. They are sensitive to proper charging and they rellay don't like being drained too low. These issues gave me a short life with them.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Jun 11 2018, 12:49 PM
Post #8


that's what I do!
***************

Group: Members
Posts: 16,974
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada



QUOTE(Chris914n6 @ Jun 11 2018, 02:04 PM) *

A dead cell would make it 10.5v. That just sounds low -- in need of charging.

Optimas hate cheap chargers. Spend the $50+ on a smart charger with trickle.

A battery at rest will hover around 12.5v


(IMG:style_emoticons/default/agree.gif)

My optima would never show more than 12.5v but it lasted 11 years.
One of the things I think I got good life out of it was because I also used it in my winter DD.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Triaddave
post Jun 11 2018, 12:49 PM
Post #9


Member
**

Group: Members
Posts: 187
Joined: 31-December 03
From: olympia,wa
Member No.: 1,478



Just did all the above. Ended up buying a new red top ($200.00 ish) They said I need the smart charger for the OPTIMA's. I was using my standard charger (trickle) and It wasn't holding a charge, although I could use the boost on the charger to get the car running. The car idled fine in the shop, but the test drive was pulsing or surging. like on/off the ignition. the car would also die at stop/lights. I've been having carburator issues...now 65 idle jets (from 60) and I'll try the 200 ac that I have (now 180 ac). webber 44 idf
It was also suggested to buy the yellow top (deep cycle) and it will take a charge easier on a car that sits in the shop for short times.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rhodyguy
post Jun 11 2018, 01:24 PM
Post #10


We're so screwed...
***************

Group: Members
Posts: 18,374
Joined: 2-March 03
From: Orion's Bell. The BELL!
Member No.: 378
Region Association: Galt's Gulch



Plenty of info out there about charging gel batteries. Beyond a certain point, you need to use the parallel charging method.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914 RZ-1
post Jun 11 2018, 05:33 PM
Post #11


Porsche Padawan
**

Group: Members
Posts: 370
Joined: 17-December 14
From: Santa Clarita, CA
Member No.: 18,230
Region Association: Southern California



Can anyone recommend a charger?

QUOTE(Chris914n6 @ Jun 11 2018, 11:04 AM) *

A dead cell would make it 10.5v. That just sounds low -- in need of charging.

Optimas hate cheap chargers. Spend the $50+ on a smart charger with trickle.

A battery at rest will hover around 12.5v

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914 RZ-1
post Jun 11 2018, 05:35 PM
Post #12


Porsche Padawan
**

Group: Members
Posts: 370
Joined: 17-December 14
From: Santa Clarita, CA
Member No.: 18,230
Region Association: Southern California



I'm also going to try jump-starting the car with my truck (2011 Chevy). Anything I should watch out for?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
burton73
post Jun 11 2018, 05:49 PM
Post #13


burton73
***

Group: Members
Posts: 1,836
Joined: 2-January 07
From: Los Angeles
Member No.: 7,414
Region Association: Southern California



The battery man told me that Optima had a problem with their Mexico factory but changed a couple of years ago.

I have had them last a very long time but they do not like it if you let them get too low on juice. I use this trickle charger and have had very good luck. I use the charger for my fork lift as well.
Good brand and not that much. Just put it on after you get home. Not a big deal and they come with a quick connect plug or reg clips. You will not need to open the mid hood just use the water proof plug.

Bob B
Attached Image

I have droped this several times and it is still good
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
plays with cars
post Jun 11 2018, 11:52 PM
Post #14


In a love / hate relationship with my car
**

Group: Members
Posts: 350
Joined: 9-November 03
From: Southeast of Seattle
Member No.: 1,323
Region Association: Pacific Northwest



I'm a fan of the BatteryMINDER brand chargers. They have a de-sulfation pulse mode when trickle charging that conditions the battery plates and breaks up the crystals that collect on the plates. It also has an AGM charging mode that adapts the charge profile to match the needs for Optima, Odyssey, ... batteries.

I'm not a fan of Optima batteries. They are more battery than we need in our cars and quality is not consistent. I used an Odyssey PC680 in my -4 for years and have been using one in my -6 for many years and its been working great.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Jun 12 2018, 12:17 AM
Post #15


Advanced Member
****

Group: Members
Posts: 2,596
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None



QUOTE(SirAndy @ Jun 12 2018, 05:53 AM) *

QUOTE(914 RZ-1 @ Jun 11 2018, 10:36 AM) *
I'm wondering what the correct reading for a good battery should be. I seem to remember reading that anything lower than 12 volts is considered in need of recharging.

Without anything drawing from it, the reading should be in the 14v range on a good battery.
However, that can be misleading since it easily can drop and not work correctly when you put load on it, even if it reads high otherwise.

Get a cheap charger and hook it up and see if the battery comes back ...
(IMG:style_emoticons/default/smile.gif)


Yep without a load test waste of time ,so much the best way you can help sort this issue,a multi-meter and a bit of time you can find out a lot, even a basic Google search will give good starting points.
Go well.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Triaddave
post Jun 12 2018, 11:42 AM
Post #16


Member
**

Group: Members
Posts: 187
Joined: 31-December 03
From: olympia,wa
Member No.: 1,478



The reason for me to use the OPTIMA was the fact that it is a gel battery and does not spill over at auto-crosses. Are these other battery's gel filled as well?
SAVE THE HELL HOLE!!.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
914 RZ-1
post Jun 13 2018, 10:13 AM
Post #17


Porsche Padawan
**

Group: Members
Posts: 370
Joined: 17-December 14
From: Santa Clarita, CA
Member No.: 18,230
Region Association: Southern California



I solved the problem!

I tried using a jump box. Nothing. Tried jumper cables. Nothing. It occurred to me that it must be a connection somewhere, since when I connected the battery cables, the CD player cycled and I could cycle the fuel pump when I turned the ignition. It was just the starter that wasn't engaging at all.

1. Battery cables were not connected tightly.
2. Loose connection on hot start relay.

Car fired right up when I corrected these issues.

I did buy a battery tender to keep the battery charged while the car is sitting.

Thanks to all for your input!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 17th August 2018 - 06:20 PM