Batteries: a 12 volt jumping a 6 volt
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
-
Topic author - Posts: 272
- Joined: Mon Jan 07, 2019 8:40 pm
- First Name: jay
- Last Name: bolante
- * REQUIRED* Type and Year of Model Ts owned: 1922 Runabout
- Location: columbia city indiana
- MTFCA Number: 31221
- Board Member Since: 2015
Batteries: a 12 volt jumping a 6 volt
I witnessed a man jump start his 6 volt battery with a 12 volt battery for his T at a car show. He said his 6 volt battery was dead and his arthritis was hurting so he couldn't arm crank. He connected the 12 volt battery via jumpers. The T started immediately then he disconnected the back up 12 volt battery right away. QUESTION: what harm was done to the T's electrical system, if any?
-
- Posts: 3299
- Joined: Sun Jan 06, 2019 10:56 am
- First Name: Dan
- Last Name: Treace
- * REQUIRED* Type and Year of Model Ts owned: '23 cutoff, '25 touring, '27 touring
- Location: North Central FL
- MTFCA Number: 4838
- MTFCI Number: 115
- Board Member Since: 2000
- Contact:
Re: Batteries: a 12 volt jumping a 6 volt
Probably none, if stock T system. If a distributor then that single 6v coil might have fried! Or if the lights were on, the lamps would blow!
Safer way, to protect the 6v storage battery is to hook 12v battery positive jumper to the 6v positive on battery, then the 12v battery negative jumper to another ground on the chassis, away from the 6v battery to prevent/risk any destruction of the 6v battery. Best done by 2, one connects the negative as the other hits the starter button, and when started, the one disconnects the negative jumper immediately.
Safer way, to protect the 6v storage battery is to hook 12v battery positive jumper to the 6v positive on battery, then the 12v battery negative jumper to another ground on the chassis, away from the 6v battery to prevent/risk any destruction of the 6v battery. Best done by 2, one connects the negative as the other hits the starter button, and when started, the one disconnects the negative jumper immediately.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
-
- Posts: 625
- Joined: Mon Oct 07, 2019 2:00 pm
- First Name: George John
- Last Name: Drobnock
- * REQUIRED* Type and Year of Model Ts owned: 1922 Coupe
- Location: Central Pennsylvania
Re: Batteries: a 12 volt jumping a 6 volt
Jumping a 6 volt system with a 12 volt battery can be done. But there are dangers.
The one that is always there, is one or both of the batteries exploding from a spark and the batteries gassing.
https://www.latimes.com/archives/la-xpm ... story.html
The one that is always there, is one or both of the batteries exploding from a spark and the batteries gassing.
https://www.latimes.com/archives/la-xpm ... story.html
-
- Posts: 1297
- Joined: Mon Jan 07, 2019 2:42 pm
- First Name: Frank
- Last Name: van Ekeren
- * REQUIRED* Type and Year of Model Ts owned: 1916 touring, 1916 pick-up, 1924 coupe, 1926 touring, 1927 touring
- Location: Rosedale Vic Australia
Re: Batteries: a 12 volt jumping a 6 volt
If the 6v was dead flat, the safest was and easiest without dicking around under the floor boards, is switch to magneto and just jump the starter motor.