Ride on batman car

[rsgaz]

20 volts DC, the top left on the dial.

 

[Sarah Wilkinson]

Backwards definitely has a reading but tricky on my own to keep prongs there for figuring how much. Forwards is no reading at all

 

[Sarah Wilkinson]

Managed keep them there a little while most it got was 5.7v backwards

 

[rsgaz]

There are more complicated tests that can determine which relay is at fault, but the simplest next step is to de-solder both of the blue relays and take them out. Then you can measure resistance across each coil independently, which can't be done in situ.

A working coil will give a reading of about 70Ω.

 

[Sarah Wilkinson]

Ok thinking of trying what motorist said as a temp fix til after Xmas so it's not so rushed then get new relays put on.

 

[jj4091]

I think reversing the polarity may damage the p.c.b. or at least not work because of the diodes

 

[rsgaz]

I think reversing the polarity may damage the p.c.b. or at least not work because of the diodes

That would be true for swapping the battery terminals, but motorbiking did initially say swap the wires at the motor, which will be fine.

 

[Sarah Wilkinson]

I will remove the motor as see how easy it is to swap the wires. I only plan it being temp

 

[Sarah Wilkinson]

https://www.maplin.co.uk/p/6v-dc-10a-spdt-pcb-relay-n08ee

Would this relay do?

 

[rsgaz]

Yeah, it looks right, hard to be 100% sure without the datasheet for it though, the link given on that page doesn't work.

 

[Sarah Wilkinson]

I went into store to show them hoping it would b simple but ended up with someone useless he asked someone who told him which to get n then guy come back saying we don't sell that no more :/ he even commented he needed his glasses so I don't know.

 

[Sarah Wilkinson]

So I rang one of my not so local stores and they seem to think that one will be ok so I'm picking them up tomorrow and giving it to my step dad to put them on so fingers crossed I shall keep you all updated

 

[Sarah Wilkinson]

Big test day tomo lol new relays have been put on I will let u all know

 

[Sarah Wilkinson]

Car still wouldn't go forward so I'm unsure what else could be causing the fault now I have for now reversed the wires at the motor which made it go forward instead of backwards lol my only guess now is 1 of two things either it is the black relay or something with the circuit board itself just as it's not very clean on the underside.

 

[rsgaz]

In the bit circled, that could be a dry solder joint. Does it feel like you can wiggle that pin just a little, compared to the other four?
As you can see from the line I added, it controls the switching of one of the relays.