Starter Motor and Ignition Circuit Thoroughly Explained! 

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That is amazing, great job! Thanks for sharing!

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Awesome! I’m glad you found it helpful. I recommend posting your projects on RU-vid so we may learn from you as well…Thanks so much!

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Sounds like a very interesting video. Thanks!

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Thanks for the kind words and for subscribing. The generator/ alternator wring set up might be a good topic for a video project in the near future. Regarding the blown fusible link, the new circuit might work without it, but it doesn’t offer the protection from current overload. I’m not familiar with your vehicle, but the fusible link was placed there for a good reason-to prevent costly damages to components. I hope you were able to replace it. Thanks again.

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The electricity has to make a complete circuit, from the positive terminal to the negative terminal. If the pathway is blocked, it will not provide electricity to the starter…Thanks!

U r stupid

Yes, the chassis becomes part of the circuit. Thank you!

Did anyone ever answer this?

Try connect the terminals on the solenoid. That will get the starter motor turning and the engine should start. Sometimes the solenoid gets sticky. So if you head the motor turning but not starting it could be sticky. Give the solenoid a gentle tap and try connect the terminals on the solenoid again. Hopefully the engine will start. You can use a screw driver or I've got a short piece of thick insulated cable I use to connect the terminals. This should give you an idea of it's just the solenoid that's giving issues. I'm not too good at testing the rest of the system. Good luck!

HeyJay, I don’t recommend doing that because solenoid is already connected to a 12volts. It might be that the ground wires are loosened or rusted…That would be something I would check next …Thanks!

Lol 😂!

​@DIY Potentials: Projects & Ideas So I have a 212cc electric start engine hooked to alternator to charge 12v batteries. Is there a product I can buy that automatically turns off the engine when the battery is fully charged and turns it on again when it needs charging? I know it exist. I think I've seen videos of it before.

Gearshift, gear stick, gear lever, gear shifter? Thanks!

great lesson of today

Exactly what he said Do you have something useful we need to know ?

If I understand your question correctly, the answer is, no. I don’t recommend doing that because the solenoid is not designed to take on so much current. That is why even the signal wire has a fuse. In addition, connecting the positive wire to the solenoid will not provide electricity to the starter motor because each runs on different circuit. With possible 400 Amps or more running through the solenoid tiny coil windings, the possibility of it being destroyed it very likely. But it is your car, not mine. Thanks for reaching out. Happy new year!

That makes sense to a tryer, Happy New year to you to .Thanks a lot, Chris.@@diypotentials

To answer your question: yes, you can start your engine by connecting the solenoid straight to the + terminal of your battery. Just make sure you only keep the contact on until the engine starts, typically about 2-3 seconds! The starter solenoid will not burn out because it has enough resistance to the 12 volts from the battery. It was meant to run on 12 volts. I was actually stuck on the road few days ago, on January 1st, it was night, holidays, and away from any repair shops. The mechanism between my key and the ignition switch under my wheel broke, but at least my steering wheel was in the unlocked position. After calling a car mechanic/electrician, I was advised I could start the engine by pushing the car since the contact was on (and I couldn't turn it off with my key). Since pushing was out of the question, I figured that I could bypass my ignition switch and go straight to the starter solenoid from the battery's positive terminal. I was aware that the starter was connected to the chassis on the negative end, and with a large wire on the positive end, i.e. always connected to the battery, and that it is engaged with a solenoid which requires a few amps (5-10 amps), while the starter motor uses at least 100 to 200 amps. I checked the internet for the starter motor location on my car, got my jumper cable, laid under the front of my car, took the solenoid connector off and attached the jumper cable. As soon as I touched battery's positive terminal, it started cranking and the engine was running within 2-3 seconds. I was very happy because that saved me a lot of money and time compared to towing my car and finding transportation for myself (at least 2 hours away from home). When I arrived home, I had to stop the engine by shifting to 4th gear (by force), since I couldn't disengage contact, and disconnecting the battery would still leave the generator running which would both keep the engine running AND likely burn car's electronics due to large voltage peaks without the battery loading and smoothing the generator's output voltage like a capacitor.

Wow. Amazing story. Glad you made back home okay. The key point here is that you are able to disconnect after 2-3 seconds just enough to get it started. Nevertheless, it is great to know. Thanks for sharing.

In this set up, yes. In real vehicles, the ground is connected to the chassis. Thanks!

@@diypotentials thanks much, I’ve been hearing a click sound sometimes when i try to start my vehicle so I’m think the problem could be the ground wire

​@@tonyswagz beat on the starter

@@gabrieldavenport1395 i did that and then changed the starter to a new one, same problem

It sounds like something in the system is draining your battery. You might want to test your battery if that is the case. I recommend doing research on parasitic draw problems on RU-vid. That might give you some other ideas for possible causes…good luck! Thanks!

Im no expert but if it works after a few hits then cleaning or new starter motor could fix, this post is a moth old tho so was wondering did you fix it mate ?

Probably not. If it's not obvious, it doesn't have one.

Thanks for the additional information. Best!

Bad battery? My engine wouldn't crank, there was no 'clicking' associated with the solenoid but my headlights and dashboard worked.