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I've bought this 1973 MGB and it is the first car i've had with two batteries I'd like to see if the car starts so wanted to connect a battery The guy i bought it from said connect the battery leads to a single battery and it should be fine This is what's there at the minute   This is the battery i have to hand  I connected the single battery to the MG connectors using jump leads and the last connection with a negative lead causes a short (big spark, lots of heat) Am i doing something slightly wrong, very wrong, or risking my life and everyone around me  I'm sure it's a negative earth car Also i removed the connectors from the existing batteries to attach the jump leads |
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I believe that an original MGB will have two 6v batteries wired in series to give 12v, so be sure that you're using the connectors at either end of that series - if you just connect your battery in place of one of the 6v batteries, you're potentially feeding 18v into the system. Which connectors (of the four shown) did you connect to the new battery?
You can switch them for something like Fiat Uno (again, I think) 12v batteries wired in parallel. The Uno batteries are small enough to sit in place of the 6v ones, but obviously you have to change the wiring.
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I used two sets of jump leads. So I had both negative connectors going to the negative on the battery and same with the positive
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I didn't know they were linked in series In this picture do you suppose the bottom right on the left battery (negative) is connected to the bottom left of the right battery (positive)  So could I put the 12v battery between the other two connectors? |
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Disregard and disconnect the link lead between the two 6v batteries.
Join a single jump lead from the positive terminal on the 12v battery to the positive terminal on the 6v battery in the first pic and then join a single lead from the negative terminal on the 12v battery to the earth point. I think it looks to be the upper terminal in the second battery pic which is attached to a lead bolted to the body.
Edit; Now you have added the pic of both batteries in one shot the bolt for the earth point is more obvious at the top of the right hand battery. So negative lead to there and positive to the lead you have removed from the left hand battery.
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Last Edit: Jan 4, 2023 18:56:40 GMT by misterm
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'50 MG Y-type (In build)
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'03 Citroen Berlingo HDi (Parts hauler)
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If you have a close look one of the cables will link the 2 batteries together, ignore both ends of this cable and use the other 2, if the old batteries are flat disconnect them as well they will just put a huge drain on the new one.
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