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1973 Datsun 620 Push Start Button Schematic HELP


redskunk

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So I've been doing a lot of research and skimming through all the forums on Ratsun and other sites, and no one could provide a schematic layout of how to wire up a push start button for a datsun 620 set up. I've searched how to wire a push start for non datsun vintage and old school cars as well on youtube and various sites. On top of that I learned how relays work and tried integrating them into this setup. But now I'm stuck. I have this last wiring issue and now i can't seem to figure how to get the truck started.

 

So the research goes on, I did several experiments. I built a small set up off the vehicle using just wires I had left over and used a small motor I found to act as the solenoid.

 

 

But however, here's what i ended up with after doing the experiments and testing the circuit with my ohm meter and test lights:

Datsun620Wiringhelp_zps893e5771.jpg

 

Please let me know if what i drew above is correct. For some reason, when I turn on the toggle switch for the push start, the truck doesn't crank. At first the starter kicked and fuel is being pumped into the carburetor. But after a while trying to crank the truck (pushing the push start) now the starter is clicking, hopefully i didn't fry the solenoid, but I was hoping the fuse would've burnt first??? However, i do notice the voltage is slowly dropping/drawing somewhere as well....I think its losing voltage at the black/white wire going to ballast resistor. I will record some more videos and take some more pics.

 

Please help! Thanks.

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Overly complicated. Pull the plug off the ignition switch and find and disconnect the Black/Yellow stripe wire. Connect a push button switch between it and the White wire... done.  You could add a hidden kill switch in this line also to make it somewhat more theft proof as well

 

You still need the ignition switch to turn on power to half the fuse box.

 

The ignition switch does this job very well as it is and is universally understood by all drivers. This adds a layer of complexity to drivers other than yourself using your truck. Stall at an intersection and there's a panic trying to get it restarted.

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Overly complicated. Pull the plug off the ignition switch and find and disconnect the Black/Yellow stripe wire. Connect a push button switch between it and the White wire... done.  You could add a hidden kill switch in this line also to make it somewhat more theft proof as well

 

You still need the ignition switch to turn on power to half the fuse box.

 

The ignition switch does this job very well as it is and is universally understood by all drivers. This adds a layer of complexity to drivers other than yourself using your truck. Stall at an intersection and there's a panic trying to get it restarted.

 

I wish i could just pull the plug off the ign switch, but the previous owner had wired in a universal ign switch. and had hacked up the wire harness. I just rebuilt a new harness. So you saying to just ditch the relay? I might just try that.

 

So would this work instead? I know the black/red wire to the coil should only have full 12 volts when the starter is cranking, so would this work?:

Datsun620Wiring2_zpse0ca1d2e.jpg

 

I also noticed the ballast resistor is not reducing the voltage down to 6-8 volts like it should. I'm getting like 11.8-11.9 volts after the resistor, and 12v before the resistor.

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YOu have a point coil 1.6 ohm or close it it? you have a 1.6ohm stock ballast resisitor. yes it should be half the voltage with key on. als depending it points are closed. open point might get a better reading.

 

also I see the seliniod wire connected to the coil. Which means when the car is running the starter will also as it wire in parrallel. the blck yellow and the blk red. it might kick on or might not at 6 volts be that is HOKY

 

Im thinking you making this too hard.

Find the hot start wire.hook that wire to 12volt contant then go to a pushbutton switch then back to Plus side coil where its should be by the coil anyway. DONE Use the color codes for that year truck. or soembody on here knows this the color of the hot start wire

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YOu have a point coil 1.6 ohm or close it it? you have a 1.6ohm stock ballast resisitor. yes it should be half the voltage with key on. als depending it points are closed. open point might get a better reading.

 

also I see the seliniod wire connected to the coil. Which means when the car is running the starter will also as it wire in parrallel. the blck yellow and the blk red. it might kick on or might not at 6 volts be that is HOKY

 

Im thinking you making this too hard.

Find the hot start wire.hook that wire to 12volt contant then go to a pushbutton switch then back to Plus side coil where its should be by the coil anyway. DONE Use the color codes for that year truck. or soembody on here knows this the color of the hot start wire

I think that's where I'm lost. I keep thinking the blk/red wire to the positive side of the coil is only supposed to be getting 12 volts when the starter is kicked on, that's why i wired the blk/red wire in parallel witth the blk/yel from the starter. I didn't think about 6 volts coming back to the starter from the blk/wht coil wire (DOH!). Thanks for pointing that out. Can you help draw a schematic for me so i can see what you are talking about? I'm more of a visual person...Thank you again.

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the START just BYPASSES the ballast resisitor so it gives it the full battery voltage as the starter motor is loading down the battery. I say it give the coil 12volt but in reality its far less. and if it went thru the ballest if you be hard to aSTART in a cold motor.

 

I mean you coul, use the cig lighter circut to have the volts then go thru a push button switch to the plus side coil(find the orginalHOT statr wire and use this if posible) But I guess you need a wire that plices off that to go to starter to CRANK the motor also. As the stock key switch was doing 2 things at the same time. BYPASSING 12volt then 12 volt also to the Starter

 

 

key ON is 12volts thru the ballast to the coil.

START is straight thru to + side coil

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