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Joined: Jun 2005
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Backyard Mechanic
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OP
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I have started up my "38". The motor is new and tight so I start with 12v and run 6v to the coil from a separate battery.
This is fine but it won't start on 6V and I need to be able to drive the car. I am using an old 6v earth strap and a 12v cable to starter.
I am going to get new cables but I don't know what the correct specifications are. I asked the local auto electrician who thought that they were all the same.
Anyone know what I should be using? Also it is a roadster with the battery up on the cowl/firewall.
Thanks
Terry H
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Joined: Dec 2001
Posts: 10,379 Likes: 1
Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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At the very least you need good 6-volt cables. You can have these made from welding cable if you can't find good ready made cables. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Mar 2003
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ChatMaster - 750
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ChatMaster - 750
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Hey Terry H, Check this thread. There are a few ideas on 6 volt battery cables.
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Joined: Feb 2002
Posts: 1,178
ChatMaster - 1,000
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ChatMaster - 1,000
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The 12v cable to the starter is most likely the problem, it is way to small to carry the amperage required to operate the starter on 6 volts. You need at least 01 gage and if possible 00 gage cables to make the 6v starter hum! I had a local battery shop make mine for me. I was having start problems with the 52, the + cable appeard to be adequate because of the bulk of the thing. I played with all the other details until I pulled the + cable and stripped the insulation, the cable was all insulation and no cable.
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The US convertible/cabriolet/ has the battery mounted under the floor-right side- in front of seat.A right hand drive car or one with a Holden body may be different.The first US Chevrolet to have the firewall mounted battery was the 1940.
You can use the large diameter 6 volt cables for 12 volt but can not use the small 12 volt cables for 6 volt.I would also suggest replacing the earth strap if its old.
Gene Schneider
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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ChatMaster - 6,000
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To my knowledge 36 37 and 38, not sure about 39 in Aus all had the battery under the floor on the right hand side.
My 38 is Holden body with battery under drivers feet just behind brake master cylinder, both battery and brake reseviour are accessed through the same lift up floor section.
Tony
1938 1/2 ton Hope to drive it before I retire
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Joined: Jun 2005
Posts: 408
Backyard Mechanic
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OP
Backyard Mechanic
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Posts: 408 |
Thank you. I am going to upgrade the cables and see how it goes. Ultimately it is new and tight but it starts easily on 12 volts so I will kep on doing that until it loosens up and should start on 6v. The car is mechanically complete but needs painting/trimming etc.
I want it to drive so I can take it out of the garage; I am getting too old to push it by myself and my dear wife doesn't enjoy it either.
Terry H
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Joined: Jun 2005
Posts: 408
Backyard Mechanic
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OP
Backyard Mechanic
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Put heavier cables into it and away it went!
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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Gene Schneider
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ChatMaster - 1,000
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ChatMaster - 1,000
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Originally posted by terry hicks:
Put heavier cables into it and away it went! Good saved another one from the cursed 12 V.
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Joined: Oct 2002
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Shade Tree Mechanic
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Shade Tree Mechanic
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Chevy lover
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