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Thread: Starter motor

  1. #1
    Rods 'n' Sods Junkie steveslittlelucy's Avatar
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    Starter motor

    Afternoon, I wonder if anyone can help,my sbc has always seemed slow turning over since Iíve had it and i wondered if the live wire was at fault ( the battery is in the boot) so this afternoon I replaced it but itís no better, when I put a volt meter on the battery feed on the solenoid it was 12.4v but when I got the Mrs to crank it it only read 4.5v, does this mean I need to get the starter rebuilt or is it a power problem- Iíve tried 2 batteries that go up into the green on a drop tester and stay there and Iíve got 2 earths on the car and one of them comes off a starter motor bolt, any advice would be appreciated

    Steve

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    I'm Not Jed Clampett stueeee's Avatar
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    How big is the cable from the battery -you really need something bigger than the usual 12v size of 16 sq mm for a long run. Something like this should work OK. I would be inclined to run an earth cable in the same size direct to the starter too.
    https://www.ebay.co.uk/itm/Copper-We...qAM1f2xFKWHN2A
    25 sq mm cable is actually about 10mm diameter.
    Stuart.
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    Rods 'n' Sods Junkie steveslittlelucy's Avatar
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    Quote Originally Posted by stueeee View Post
    How big is the cable from the battery -you really need something bigger than the usual 12v size of 16 sq mm for a long run. Something like this should work OK. I would be inclined to run an earth cable in the same size direct to the starter too.
    https://www.ebay.co.uk/itm/Copper-We...qAM1f2xFKWHN2A
    25 sq mm cable is actually about 10mm diameter.
    Thanks for the reply, I bought some 21 mm 170amp wire off of eBay but I must admit It’s funny stuff , it doesn’t take solder that well, my father in law has some old arc welding wires that are quite long , I think I’ll do both like you suggested .
    Steve

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    Official RnS Addict timbo56's Avatar
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    It could be the solenoid is worn or not connecting properly or you have old cable and dirty connections. Mine was slow or wouldn't start when hot. I used 70mm 485 amp cable on my SBC plus I fitted a second solenoid with the switch wire jumped straight from the large starter cable connector.
    70mm2 485 A Amps Flexible PVC Battery Welding Cable Black Red 1 - 100M M Lengths | eBay
    As an after thought, is your switch wire wired correctly I.E. not running from a ballast resistor?
    Last edited by timbo56; 30-10-2017 at 19:19.

  7. #5
    Rods 'n' Sods Junkie steveslittlelucy's Avatar
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    Quote Originally Posted by timbo56 View Post
    It could be the solenoid is worn or not connecting properly or you have old cable and dirty connections. Mine was slow or wouldn't start when hot. I used 70mm 485 amp cable on my SBC plus I fitted a second solenoid with the switch wire jumped straight from the large starter cable connector.
    70mm2 485 A Amps Flexible PVC Battery Welding Cable Black Red 1 - 100M M Lengths | eBay
    As an after thought, is your switch wire wired correctly I.E. not running from a ballast resistor?
    I think tomorrow I’m going to get it up on the lift and put 2 very short leads to the starter to see if it’ makes a difference before I go any further and if that works I’ll use some welding leads, the wire to the solenoid comes straight from the ignition , thanks for the advice
    Steve

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    Official RnS Addict timbo56's Avatar
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    Quote Originally Posted by steveslittlelucy View Post
    I think tomorrow I’m going to get it up on the lift and put 2 very short leads to the starter to see if it’ makes a difference before I go any further and if that works I’ll use some welding leads, the wire to the solenoid comes straight from the ignition , thanks for the advice
    Steve
    While you're doing that you could try putting a direct feed from the battery to the switch terminal on the solenoid (so you're bypassing the ignition switch) with some new wire to see if that makes any difference.

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    Full Bloody Rebel! Mad Mark's Avatar
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    Mine was always slow, but slowly speeded up........ In the end I replaced the starter with a hi-torque unit that was £100 from Russ Pepper. perfect after that! ...and as a bonus I was able to turn the solenoid down away from the exhaust to stop the ole SBC heat soak problem I had had for ages!
    If I wasn't meant to go that fast, the pedal would only go half way!

  10. #8
    Rods 'n' Sods Junkie steveslittlelucy's Avatar
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    This afternoon I put 2 short leads straight to the starter with a remote starter button and it turned over a lot faster so I’ve made a new battery holder and put it back in the engine bay so hopefully it’s sorted now, thanks for everyone’s help.
    Steve

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