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Author: Subject: Starter motor cable rating
FamilyGuy

posted on 31/8/18 at 07:44 PM Reply With Quote
Starter motor cable rating

I need to buy some cable to connect battery to starter motor on my focus st170 engined build. Problem is I don't know what amp cable is required. They seem to range from 110 amp to 485 amp. The length of the cables will less than 1.5m.
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big-vee-twin

posted on 31/8/18 at 09:51 PM Reply With Quote
I bought some ready made one's from Halfords, don't think they were too expensive.





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paulc

posted on 31/8/18 at 10:23 PM Reply With Quote
Not sure how much help it is, but I used 300 Amp for my Rover V8.
Works fine.

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FamilyGuy

posted on 1/9/18 at 08:12 AM Reply With Quote
CBS do 345 amp 50mm2 cable, that should do the trick then.
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40inches

posted on 1/9/18 at 09:15 AM Reply With Quote
I would say that 25mm would be more than adequate. Try VWP http://www.vehicle-wiring-products.eu/product.php/579/battery-starter-cable
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paulc

posted on 1/9/18 at 08:58 PM Reply With Quote
Yep, I went with 300 amp (40mm2) to be on the safe side for a V8.

You can probably go down in rating from there for a 4 cylinder.

Paul

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FamilyGuy

posted on 2/9/18 at 08:57 PM Reply With Quote
If I go with 40mm2 then I should be safe. I'd rather stay on the safe side.
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paulc

posted on 2/9/18 at 10:22 PM Reply With Quote
I think you could probably go with 25mm2, but 40mm2 will definately be ok.
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jossey

posted on 3/9/18 at 05:14 AM Reply With Quote
Speaker wire should be ok. The stuff from wilkinsons....





Thanks



David Johnson

Building my tiger avon slowly but surely.

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FamilyGuy

posted on 13/9/18 at 09:28 PM Reply With Quote
Quick update. I measured the standard focus starter cables today and the core was approx 6mm diameter which would mean about 28mm2.

I guess I'll go with 35mm2 cable then instead of 40mm2 and I'll be well safe still.

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