retired1 wrote:I do not understand. Your car should only be under power for 5 seconds or less. That is not enough current draw to cause your problem
That said, what amperage is your motor rated at for 6 volts?
retired1 wrote:What is your motor name and number? I might be able to find something equivalent.
retired1 wrote:Your motor must have some markings on it. That will help to determine Its amperage.
For a 550 size motor at 6 volts, you will have about 2.5 amps NO load and up to about 15 amps loaded. Stall amperage can be as much as 125 Amps. If you do not have reasonable gears, you probably are reaching near stall current for a short period of time. Your battery box will not stand that. Your buggy should instantly take off very fast or spin the wheels or not turn (stall). Somewhere in between.
If your wire sizes are small, this will generate heat in the wire and run the load up further.
I have the same battery setup that you do and do not have that problem. My problem is that the poor contacts will regularly not make contact, This required putting some brass inserts in to make sure that it made contact.
Also cut the wire from the battery box and soldered in much larger wire.
If you believe that the steel springs are not carrying the load, but are heating like a toaster, You might want to try cutting some fairly thin 1" wide brass stock (from a big box store) about 1/2" tall and slide that between the adjacent contacts. Should take 4, 2 on each end with no contact between strips.
I have never done this, so do not know what problems that it might cause like burning your motor up.
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