Battery Voltage when cranking.

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.
Post Reply
User avatar
Armyspecial
G-Colonel
G-Colonel
Posts: 1548
Joined: Mon Jul 09, 2007 12:31 am
Location: Suffolk, England

Battery Voltage when cranking.

Post by Armyspecial » Wed May 27, 2015 9:58 pm

Hi,
My battery measures 6.5 Volt now it's fully charged but I'm trying to find out what this shouldn't drop below when cranking. A 12 volt battery shouldn't drop below 10 volts, so can I assume a 6 volt shouldn't drop below 4? Thanks Richard.
44 Ford GPW 197755 REME Rebuild - British No 53 YH 48 Hood No M6015520 (Actual)
42 Ford GPW 52726 Hood No 20132506 (Actual) DOD 4TH AUG 42 (Ex NAAS Oceana)
44 Bedford MWD
http://www.omvc.moonfruit.com" onclick="window.open(this.href);return false;


User avatar
artificer
banned
Posts: 13558
Joined: Tue Jul 11, 2006 10:46 am
Location: SINGAPORE

Re: Battery Voltage when cranking.

Post by artificer » Wed May 27, 2015 10:47 pm

Better than:
4.8 volts with a 6-volt system
9.6 volts with a 12-volt system
18 volts with a 24-volt system
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.

User avatar
Armyspecial
G-Colonel
G-Colonel
Posts: 1548
Joined: Mon Jul 09, 2007 12:31 am
Location: Suffolk, England

Re: Battery Voltage when cranking.

Post by Armyspecial » Wed May 27, 2015 10:48 pm

Thanks John.
44 Ford GPW 197755 REME Rebuild - British No 53 YH 48 Hood No M6015520 (Actual)
42 Ford GPW 52726 Hood No 20132506 (Actual) DOD 4TH AUG 42 (Ex NAAS Oceana)
44 Bedford MWD
http://www.omvc.moonfruit.com" onclick="window.open(this.href);return false;

User avatar
Armyspecial
G-Colonel
G-Colonel
Posts: 1548
Joined: Mon Jul 09, 2007 12:31 am
Location: Suffolk, England

Re: Battery Voltage when cranking.

Post by Armyspecial » Wed May 27, 2015 11:05 pm

Also, what diameter should the cables ideally be as I have no idea if mine are good enough or not? Positive cable measures 15mm and the Negative 12mm. Richard.
44 Ford GPW 197755 REME Rebuild - British No 53 YH 48 Hood No M6015520 (Actual)
42 Ford GPW 52726 Hood No 20132506 (Actual) DOD 4TH AUG 42 (Ex NAAS Oceana)
44 Bedford MWD
http://www.omvc.moonfruit.com" onclick="window.open(this.href);return false;

User avatar
nick peters
G-Brigadier General
G-Brigadier General
Posts: 2397
Joined: Sun Jul 22, 2007 9:55 am
Location: Leicestershire England

Re: Battery Voltage when cranking.

Post by nick peters » Wed May 27, 2015 11:29 pm

Hey Richard
Your cables seem too thin :roll: Original' positive' is at around 20mm without the cotton cover. Negative at about 15 mm no cover. Wire strands are fairly thick as well.
regards Nick

User avatar
Armyspecial
G-Colonel
G-Colonel
Posts: 1548
Joined: Mon Jul 09, 2007 12:31 am
Location: Suffolk, England

Re: Battery Voltage when cranking.

Post by Armyspecial » Wed May 27, 2015 11:35 pm

Hello Nick,

Hope all is well mate. I assume that could have an effect on cranking speed?? Will the likes of Nick Jeffreys stock the correct size ones?
44 Ford GPW 197755 REME Rebuild - British No 53 YH 48 Hood No M6015520 (Actual)
42 Ford GPW 52726 Hood No 20132506 (Actual) DOD 4TH AUG 42 (Ex NAAS Oceana)
44 Bedford MWD
http://www.omvc.moonfruit.com" onclick="window.open(this.href);return false;

User avatar
nick peters
G-Brigadier General
G-Brigadier General
Posts: 2397
Joined: Sun Jul 22, 2007 9:55 am
Location: Leicestershire England

Re: Battery Voltage when cranking.

Post by nick peters » Thu May 28, 2015 1:25 am

Hey Richard
Yes the cable thickness certainly has an effect. You need them thicker to reduce resistence. Not sure about Nick Jeffries, but Cliffe at Universal will have them for sure. :)
regards Nick
ps Are you coming up to the Victory show this year?


Post Reply

Return to “MB GPW Technical Knowledge Base”

Who is online

Users browsing this forum: bellvine, Google [Bot], Vic ALLAN and 54 guests