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71' 510 won't shut off with the key


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You have an internally regulated alternator on a vehicle that should have an external regulator. '78 and on Datsuns were internally regulated.

 

What you can do is convert your harness to eliminate the regulator. It requires joining two pair of wires.

 

6alternator_ir.jpg

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has it been this way for awhile ot you just put this motor in with a later model alternator.

 

 

YOu can disconnect the volt reg ,

as above drawing will show. you can make 2 jumpers with male blade connectors and jumber the colored wires in the engine side of the harness. So no cutting of harness!!!!!!!!

or you can get a say a 75 610  50amp alternator(external volt reg type) to install on that a L20.

 

 

 

if this was running fine fine and it had a early model alternaotr in there already and just stsarted happening then the 510 volt regis bad.

 

 

need to give more infor. a 79 motor doent mean it has a 79spec alternator in there

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First, Thanks guys for all the info. 2nd, This is a new project that I am working on. Old 71' that has been with me for about 15 years with a motor and trans I just bought this motor and put it in. Just got the car running for the first time. Gonna try the jumper fix

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old alt might be a L16 tyep 35 amper and have the smaller hole size. L20 mounts use the bigger holes. I guess one could bore out the L16 alt if he still has it

That's what I do. I drill the whole bracket to eliminate the two bolts and use one long bolt all the way through the alternator and bracket.

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