Morning all
The battery in my 911 is completely flat - I’m trying to start it with a lithium jump starter but it’s showing a reverse polarity indicator even with its cables connected correctly. Checked on another car and the jump starter works fine.
Anyone have any idea what could be going on? Maybe the battery is dead??
Thanks
Damian
Dead battey
Moderators: hot66, Miggs, 58A - 71E, impmad2000, drummerboytom, Barry, Helen, Viv_Surby, Derek, KS, abm914, Mike Usiskin
Dead battey
1981 911 SC
1973 911 T - gone to a new home
1973 911 T - gone to a new home
-
- Put a fork in me, I'm done!
- Posts: 1672
- Joined: Fri Mar 01, 2013 11:45 am
- Location: Kernow - good old Cornwall
Re: Dead battey
Have you tried to start the car with the jump starter with the cables actually off the battery?
If the jump starter is showing a wrong polarity, its possible the plates in the battery have buckled and are forming a contact inside the battery. If they are, you need to remove the battery soonest so nothing is damaged?
If the jump starter is showing a wrong polarity, its possible the plates in the battery have buckled and are forming a contact inside the battery. If they are, you need to remove the battery soonest so nothing is damaged?
-
- Put a fork in me, I'm done!
- Posts: 1594
- Joined: Tue Aug 24, 2010 11:56 pm
- Location: Northern Ireland
Re: Dead battey
Firstly I think your better off buying a new battery, however I've recovered dead batteries before even with "smart" battery chargers that either show up a "dead" code and then won't charge. What I do is get the dead battery and a good battery connect + to + and - to - then connect the battery charge to either one of the + and -. What happens in laymans terms is that the charger see some voltage so will charge both batteries at the same time. After an hour or so the good battery can be removed and there should be enough charge in the dead batter for the charger to work. I'd then deep cycle charge for 2 / 3 days and see if that recovers it. My 2p worth,.
65 911 FIA race car
66 911 RHD restoration
67 911S LHD
74 911 Carrera 2.7 US Spec
79 Aistream Excella 28 MH
97 Bimota Vdue
14 KTM 690R Duke
83 RD350 YPVS
08 Ducati M900
00 Ducati 996SPS
944 T, 3.2 RSR, GT3 - SOLD
66 911 RHD restoration
67 911S LHD
74 911 Carrera 2.7 US Spec
79 Aistream Excella 28 MH
97 Bimota Vdue
14 KTM 690R Duke
83 RD350 YPVS
08 Ducati M900
00 Ducati 996SPS
944 T, 3.2 RSR, GT3 - SOLD
Re: Dead battey
End of. Fools errand to do anything else in my experience!redrobin911 wrote:Firstly I think your better off buying a new battery