Hello. My dad's battery charger has failed. It is a Motomaster 141-243-904 from 1994. He says he was charging a car, and when he came back one of the clip was on the ground. When he attached it back to the pole the charger smoked and stopped working.
The rectifier is a big plate with 4 diodes. The ones on the left appear to be working while the ones on the right are shorted. The right side is also the one that is damaged as you'll see in the picture I'll post. The transformer is very rusty and noisy but appears to be working. So I think all this charger would need to work again is 2 new diodes. Unfortunately they really do not want you to change the diodes, everything is riveted and weld together, you can't even remove the diodes without brutalizing the rectifier. And I have never seen this type of diode before, they are short black circles.
What is this type of diode called?
What are the ratings/specifications to take into consideration when choosing a replacement?
How come only the negative lead goes through the rectifier?
What would you replace the diodes or whole rectifier with?
https://i.ibb.co/NnpK7Y5/DSC07422-min.jpg rectifier
https://i.ibb.co/wRC7QLQ/DSC07423-min.jpg diodes
https://i.ibb.co/PF0swNn/DSC07426-min.jpg charger
The rectifier is a big plate with 4 diodes. The ones on the left appear to be working while the ones on the right are shorted. The right side is also the one that is damaged as you'll see in the picture I'll post. The transformer is very rusty and noisy but appears to be working. So I think all this charger would need to work again is 2 new diodes. Unfortunately they really do not want you to change the diodes, everything is riveted and weld together, you can't even remove the diodes without brutalizing the rectifier. And I have never seen this type of diode before, they are short black circles.
What is this type of diode called?
What are the ratings/specifications to take into consideration when choosing a replacement?
How come only the negative lead goes through the rectifier?
What would you replace the diodes or whole rectifier with?
https://i.ibb.co/NnpK7Y5/DSC07422-min.jpg rectifier
https://i.ibb.co/wRC7QLQ/DSC07423-min.jpg diodes
https://i.ibb.co/PF0swNn/DSC07426-min.jpg charger