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Starter issues and 12v conversion #1333792 Thu Nov 14 2019 07:18 PM
Joined: Oct 2019
Posts: 81
T
Tony292 Offline OP
Shop Shark
My new to me 1940 216 1.5 ton runs amazingly... if I can get it started!

I have a used 6v battery and a brand new 6v battery that the previous owner included with the sale. Even when I jump them together I get slow cranking and 50/50 chance of it starting. It doesn’t seem to matter how much I charge the 6v batteries they still crank super slow.

Then I tried jumping to a 12v battery and WOW! It started in half a revolution!!! I mean it started quickly and with a purpose! It seems that doubling the cranking speed is like starting magic!!

So Instead of replacing the old 6v starter I’m considering keeping it and just converting the whole system to 12v negative ground.

Advice?

Last edited by Tony292; Thu Nov 14 2019 07:20 PM.
Re: Starter issues and 12v conversion [Re: Tony292] #1333799 Thu Nov 14 2019 08:13 PM
Joined: Feb 2004
Posts: 19,282
H
Hotrod Lincoln Offline
Boltergeist
A 12V conversion is a cop-out by people who are unwilling to go to the effort needed to make 6 volts work. There is a huge amount of information archived here on the subject, and I'll suggest you read as much of it as possible before making a decision one way or another. I'm dealing with a crippled right hand after surgery for an infection, or I'd be glad to waste a few billion more electrons than the ones I've already dedicated to the subject. Long story short- - - - -6 volt cranking/charging systems are perfectly adequate to get the job done, but they DO NOT respond to a piecemeal approach. Every connection and component MUST be exactly right.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Starter issues and 12v conversion [Re: Tony292] #1333813 Thu Nov 14 2019 11:00 PM
Joined: Sep 2001
Posts: 28,911
tclederman Offline
Boltergeist
6v has been working OK for me since 1969.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
Re: Starter issues and 12v conversion [Re: Tony292] #1333824 Fri Nov 15 2019 12:56 AM
Joined: Mar 2019
Posts: 387
G
glenns towing Offline
Shop Shark
Ditto on the 6 volt working as designed. I dont have the extensive time under my belt as tclederman has, but unless you have a legit reason to change to 12 v, then why? In my 51 Chevy 2dr sdn, I used the factory 6 volt system for 3 years or longer. Worked well, headlights were suffice, along with everything else powered by it. Not to mention, I could see without blinding all who where coming at me. Truth of the matter is I would still be using the 6 volt system, except I put a 261 in place of the 216 when the clutch failed. The 261 was waiting patiently for a reason to be put to work. I switch to 12 v at that time because that's what powered the 261. I also kept it a generator setup as it seemed right at home for it. Anyhow, my point is that if it aint broke, dont fix it. And if it is broke, fix it as it was designed. 6 volt batteries are pretty available to boot. 6 volt starters love 12 volts.....I guess you figured that out already.

Re: Starter issues and 12v conversion [Re: Hotrod Lincoln] #1333827 Fri Nov 15 2019 01:36 AM
Joined: Oct 2019
Posts: 81
T
Tony292 Offline OP
Shop Shark
I understand 6V negative ground, I have an old ford tractor that has the same system. It started hard until I installed electronic ignition. Now it starts like a champ. Every vehicle so different and hs been treated differently during its life.

Re: Starter issues and 12v conversion [Re: bartamos] #1333833 Fri Nov 15 2019 02:40 AM
Joined: Oct 2019
Posts: 81
T
Tony292 Offline OP
Shop Shark
I was with the previous owner when he went to Napa and bought the new battery.... so I know it’s new. Jumping with 6v it still cranked slow. Jumped with 12v and it turned over much faster and started almost instantly.

Re: Starter issues and 12v conversion [Re: Tony292] #1333835 Fri Nov 15 2019 02:55 AM
Joined: Feb 2004
Posts: 19,282
H
Hotrod Lincoln Offline
Boltergeist
If you're trying to use jumper cables with the new battery, you're wasting your time. Bolt the new battery in, with BIG cables hot and ground, and your slow crank problems will probably go away. Otherwise you're wasting everybody's time, including your own.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Starter issues and 12v conversion [Re: Tony292] #1333846 Fri Nov 15 2019 03:55 AM
Joined: May 2015
Posts: 1,580
K
klhansen Offline
Shop Shark
First thing I would check would be the cable connections at the battery. They should be shiny clean on the in side of the clamps as well as on the battery posts. Also check the cables themselves for corrosion. The green goo that develops under the insulation is terrible at conducting electricity.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos

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