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Hi the the only car I have to jump start my own has no negative terminal so will it still work if the black lead is just connected on a metal part of each car?

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    How is it that there is no negative terminal on the battery? There is no such thing as a single-pole battery. – jwh20 Nov 18 '19 at 18:29
  • Maybe there is I just can't see or find any way to access it. – Blazin Nov 18 '19 at 19:42
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    @jwh20 There are plenty of designs where the battery is not easily accessible. Some times its in the fender, under back seat, in the truck, etc... My Sprinter has the battery bolted under the drivers floor board. Generally in these cases there is a easily accessible post for the positive side of the batter but no clear point for a ground (since you can ground just about anywhere) but if you do not know this off hand then you would wonder where the ground terminal is. – narkeleptk Nov 19 '19 at 0:26
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    @narkeleptk's case is similar to my Transit - but on the Transit as well as a positive terminal under the bonnet there's a great big ring on the engine itself to connect the negative (I wouldn't be surprised if it's also a lifting eye) – Chris H Nov 20 '19 at 15:47
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Yes. A good grounded metal part will connect to the negative of your hidden battery and is pretty much the same thing.

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    Best place to jump the negative would be a suitable place on the engine. – HandyHowie Nov 18 '19 at 15:21
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    Great thanks for the quick reply :) – Blazin Nov 18 '19 at 15:29
  • Best place will be a good earth point on the chassis... – Solar Mike Nov 18 '19 at 17:49
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    @SolarMike Seriously? Read step 7 here - rac.co.uk/drive/advice/car-maintenance/how-to-jump-start-a-car By connecting the negative to the chassis you are adding the extra resistance of the engine earth strap to the circuit. The best place to connect the negative jump lead on the dead car is on the engine. See RAC photo too. – HandyHowie Nov 18 '19 at 19:17
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    @SolarMike I doubt very much that an RAC mechanic took time out from driving his van to write that article. It also doesn’t matter how the engine is connected to the chassis, it is still called an engine earth strap and will add extra resistance to the circuit. – HandyHowie Nov 18 '19 at 19:48

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