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D15 Diesel Series 1 Battery Cables
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jenester View Drop Down
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Joined: 11 Mar 2013
Location: SW Virginia
Points: 22 		Post Options Post Options   Thanks (0) Thanks(0)   Quote jenester Quote  Post ReplyReply Direct Link To This Post Topic: D15 Diesel Series 1 Battery Cables
    Posted: 22 Dec 2025 at 9:03am
I’m adding the second battery (fender mount) to my D15 Diesel Series 1. What size cables do I need to run? I can’t find any information as far as OE goes so I’m thinking 1/0 just based on length and amperage. Does anyone have any firsthand knowledge they can share?
1961 D15 Diesel
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 89248 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 22 Dec 2025 at 4:47pm
Stock was probably 2 Gauge... I would agree that the 1/0 is a good upgrade and real benifit when its cold outside..
Like them all, but love the "B"s.
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Joined: 02 Feb 2017
Location: Aiken SC
Points: 117 		Post Options Post Options   Thanks (0) Thanks(0)   Quote WeisAC2 Quote  Post ReplyReply Direct Link To This Post Posted: 21 hours 3 minutes ago at 10:02am
Steve @ B&B Custom circuits made one for my D15 diesel.  I'm pretty sure it was 2/0 and was 8 foot in length to get back to the accessory battery over the axle.  Works well and definitely helps having 2 batteries.  
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PaulB View Drop Down
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Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 5196 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PaulB Quote  Post ReplyReply Direct Link To This Post Posted: 11 hours 58 minutes ago at 7:07pm
Bigger can't hurt when it comes to battery cables. They should never feel hot when starting, if so you're either cranking the engine tooo long or the cables are tooo small.
If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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