Cool. Lithium batteries really help these resistor systems last longer because they don’t have nearly as much surge current to drag around 500lbs of lead
I took the easy path and bought a motor controller. The resistors just burn off battery power. They do work and parts are still available. I'm using the same batteries built up to 14s for 48 volt nominal. If you buy 7 of the 36 volt(10s) from Batteryhookup, you can make 5 x 14s beasts for 12.5kWh in parallel. The are amazing batteries. You just need longer all-thread and a couple more busbars and insulators also available from battery hookup. They are like Lego, easy to build any configuration.
@@RetroElectric I'm now on my 3rd way of wiring (3 different diagrams I found). Think it's finally sinking in on what it wants. Question, can a field wound motor work instead of the series wound if I keep the concept of a1-f1, a2-f2 like a1-s1, a2-s2? Needing to use a rear end that has different splines. My other project is stretching an ezgo 43" and have installed a Sequential Port Injection Harley engine and trans from a FLH. Been fun getting everything working right. Again thanks for the information.
@@howitstartsmm so in short I’m not entirely sure. I was bench testing a rear end that had one of those motors in it. What I don’t understand most about those motors is why they don’t call them parallel motors. Series motors run the two fields in series and field wound motors run them in parallel. Speed controlling a field motor is done a little different I think but I’m not sure because I didn’t test it much further but I’ll post a video of my rear ended that has that motor and try and explain some of my findings. Most stuff I’ve found on those motors is horrendously overcomplicated explanations of how the motors work.
@@RetroElectric Well, I went ahead and wired it as if both motors were internally similar. After playing with the F-R switch and accelerator (with jack stands supporting tires off the ground) the motor would turn, sporadically and reverse of indicated direction. After not burning anything up(and watching your video three more times) I focused more on the negative circuit instead of positive circuit. SUCCESS! I now have forward/ reverse and speed control. I will post a picture of the wiring diagram and a short video on my channel after I clean things up a little. Again thank you for the information you shared.
@@howitstartsmm yay!!!! The first time I successfully got reversed fired up was an extremely joyous time! I did have a diagram I drew up for myself laying around somewhere.
Just make sure all the connections are good and the brushed connector is good. Putting a lithium battery on it will majorly lighten the load and be easier on the brushed connection.
So I have been looking to do one of these builds using the exact same battery from battery hookup.. I wanted to run 4 of them in parallel and series to give me 72v @96ah if I’m not mistaken… what are your thoughts since you are messing with them? I have an AC navitas motor on my cart and I really want something that I can push that motor to the limit !!! I live in York pa so I can always pick the battery’s up too
6.9kwh battery is insane for a golf cart. I will be getting testing data back soon from this cart. Distance is probably between 10-25 miles with just one battery at 1.7kwh. Technically an AC motor will be a little more efficient than the old series one but I also have zero loss under full throttle because I have no controller. Pedal to the metal on these old carts is direct from the battery.
Do you happen to have any info for a 78 HD cart? The cart has a resistor like the one you have there but it has 3 solenoids also. I can't seem to find any info on it and I have 0 movement out of it.
It probably uses a lower amp brush pedal and the pedal engages different solenoids to make contact at different parts of the resistor. If you can upload a video so I could see if that would help me out. I think you can tag me in the video so that I would get a notification hopefully.
So I have this resistor style 36v cart....I've switched to 3 12v deep cycle batteries and since I've done so my brand new batteries drain super quickly like 20-30mins max my cart stops...why is that? Is there any way to have it go a lil longer? Help appreciated
I got a friend that has one I need to help wire up maybe I’ll make a better video of that. I really didn’t expect this video to do that well. It’s a horrible video in my opinion. 😅
Super helpful dude, I just got a similar model. Finna replaces some wiring and build a batt, wanna run lipho4.
Cool. Lithium batteries really help these resistor systems last longer because they don’t have nearly as much surge current to drag around 500lbs of lead
I took the easy path and bought a motor controller. The resistors just burn off battery power. They do work and parts are still available. I'm using the same batteries built up to 14s for 48 volt nominal. If you buy 7 of the 36 volt(10s) from Batteryhookup, you can make 5 x 14s beasts for 12.5kWh in parallel. The are amazing batteries. You just need longer all-thread and a couple more busbars and insulators also available from battery hookup. They are like Lego, easy to build any configuration.
Awesome. I like some of the resistor carts but I do hate if I have to work on them.
Thank you the awesome explanation. I'm trying to revive a completely disassembled old Melex 36v resistor cart, I like a challenge.
It can be confusing! 🤯
@@RetroElectric I'm now on my 3rd way of wiring (3 different diagrams I found). Think it's finally sinking in on what it wants.
Question, can a field wound motor work instead of the series wound if I keep the concept of a1-f1, a2-f2 like a1-s1, a2-s2? Needing to use a rear end that has different splines.
My other project is stretching an ezgo 43" and have installed a Sequential Port Injection Harley engine and trans from a FLH. Been fun getting everything working right.
Again thanks for the information.
@@howitstartsmm so in short I’m not entirely sure. I was bench testing a rear end that had one of those motors in it. What I don’t understand most about those motors is why they don’t call them parallel motors. Series motors run the two fields in series and field wound motors run them in parallel. Speed controlling a field motor is done a little different I think but I’m not sure because I didn’t test it much further but I’ll post a video of my rear ended that has that motor and try and explain some of my findings. Most stuff I’ve found on those motors is horrendously overcomplicated explanations of how the motors work.
@@RetroElectric Well, I went ahead and wired it as if both motors were internally similar. After playing with the F-R switch and accelerator (with jack stands supporting tires off the ground) the motor would turn, sporadically and reverse of indicated direction. After not burning anything up(and watching your video three more times) I focused more on the negative circuit instead of positive circuit. SUCCESS! I now have forward/ reverse and speed control. I will post a picture of the wiring diagram and a short video on my channel after I clean things up a little.
Again thank you for the information you shared.
@@howitstartsmm yay!!!! The first time I successfully got reversed fired up was an extremely joyous time! I did have a diagram I drew up for myself laying around somewhere.
That motor can run on 72v
Replace resistors with 48v or 72v series controller
Add throttle sensor and voila. Fast cart good control
Already done that!
Awesome video man, saving this one lol. What’s the biggest point to the resistors
Just make sure all the connections are good and the brushed connector is good. Putting a lithium battery on it will majorly lighten the load and be easier on the brushed connection.
So I have been looking to do one of these builds using the exact same battery from battery hookup.. I wanted to run 4 of them in parallel and series to give me 72v @96ah if I’m not mistaken… what are your thoughts since you are messing with them? I have an AC navitas motor on my cart and I really want something that I can push that motor to the limit !!! I live in York pa so I can always pick the battery’s up too
Do it!!!! These batteries are awesome!
6.9kwh battery is insane for a golf cart. I will be getting testing data back soon from this cart. Distance is probably between 10-25 miles with just one battery at 1.7kwh. Technically an AC motor will be a little more efficient than the old series one but I also have zero loss under full throttle because I have no controller. Pedal to the metal on these old carts is direct from the battery.
When the pedal is depressed would more voltage go to the motor from the potentiometer? Can this reading be seen on the solenoid?
This type of golf cart doesn’t have a potentiometer
Do you happen to have any info for a 78 HD cart? The cart has a resistor like the one you have there but it has 3 solenoids also. I can't seem to find any info on it and I have 0 movement out of it.
It probably uses a lower amp brush pedal and the pedal engages different solenoids to make contact at different parts of the resistor. If you can upload a video so I could see if that would help me out. I think you can tag me in the video so that I would get a notification hopefully.
@@RetroElectric I''l go record one and upload it here to my channel. Thank you for the offer of some help.
ruclips.net/video/k0wNx8p3vZg/видео.html
Can you make a video on how to bypass that resistor to go faster?
Full throttle does bypass the resistor. You need more voltage to go faster.
So I have this resistor style 36v cart....I've switched to 3 12v deep cycle batteries and since I've done so my brand new batteries drain super quickly like 20-30mins max my cart stops...why is that? Is there any way to have it go a lil longer? Help appreciated
What kind of deep cycle? Just a standard Marine deep cycle? Or something bigger? Like 100ah
@@RetroElectric standard marine deep cycle 12v...
@@LamzLamz714 I would say buy three more. Those don’t have a lot of capacity.
What's the make and model of that cart? I believe I have one similar if not the same
I don’t remember. I don’t typically categorize based on body and model but rather what’s inside. 🤷🏼♂️
i have the same cart. do something on how the batteries are connected.
I wish there was an actual video of someone showing where the wires go. It's been a pain just bought one that wasn't wired and they all skip atpund
I got a friend that has one I need to help wire up maybe I’ll make a better video of that. I really didn’t expect this video to do that well. It’s a horrible video in my opinion. 😅
@@RetroElectric let me know. I'm ready lol