Just what is available OTC at your local auto-parts store. This does not count the computerized Arduino-based systems. There are any number of variations, but on basic themes. Proof that you do not know what you are doing:Ī) There are roughly four (4) lead-acid battery charger circuits. A small portion of that power damaged your old charger - and given your general understanding of the process, it is dubious that any repairs effected by you would be safe for you or those around you. Repeat, a car battery contains a great deal of energy stored in a fast-release system that also happens to use some nasty chemicals. A poorly designed charger puts *you* in danger, as well as the charger. However, it can release as much or more than 7.2 KW (that would be kilowatts) for a few seconds - what it does when it starts a car.

Now, try to understand something: The typical car battery contains about as much energy as it takes to operate 6.5 100-watt incandescent lamps for about an hour - at which point, it will be flat. And pay attention to the pretty pictures as only about 35% of Americans can understand written-only directions.

Amazon has any number of options, just not at $29.99.Ĭ) Read the directions.

Clearly you are not competent to fix it, as they are fundamentally simple beasts with only a few failure modes - Mike pointed that out.ī) Purchase a proper charger from a reasonable source. Not sure how yet.Ī) Trash the HF charger. I resoldered a 3rd one and it blew the same spot.Ĭan anyone suggest what I should be test/measuring and why the relay keeps going out? I'm not giving up on the charger just yet. There is a metal leg? in between 2 others and this continues to blow out. The SRU-06VDC-SL-C relay went out in the same spot the original did. After a few cycles it popped and started smoking. Only thing was the analog meter wasn't moving, it was stuck at 100%. I assumed by the noise it was making, buzzing followed by silence. When I plugged it in and attached it to my mower battery it lite up and seemed to be in a cycle of charging. I used a 50A Auto Automatic Reset Stud Type Circuit Breaker for the thermal fuse. I replaced the relay with the same Songle Relay SRU-06VDC-SL-C type. I inspected the insides and found that the thermal fuse was melted and a relay had burned out. I was attempting to charge my riding mower battery when it fried. I have a Harbor Freight Cen-Tech Battery charger SKU 60653.

How to use cen tech battery charger