richmondred01 2,237 #1 Posted April 28, 2014 520h was running fine then started over charging. That lead to the 30 amp fuse melting down. Got the 30 amp fuse out and replaced it. Now there is no power at all not even for the lights. Where should I start looking? Share this post Link to post Share on other sites
Ed Kennell 37,998 #2 Posted April 29, 2014 Check the battery , then the B terminal on the ignition switch. To melt the wire to the 30 amp fuse, you must have a dead short to ground. Did the drive belt get against the wiring harness and wear it thru ? Share this post Link to post Share on other sites
slammer302 2,155 #3 Posted April 29, 2014 Had that happen to me and it ended up being the ignition switch went bad Share this post Link to post Share on other sites
Save Old Iron 1,566 #4 Posted April 29, 2014 (edited) 520h was running fine then started over charging. That lead to the 30 amp fuse melting down. Got the 30 amp fuse out and replaced it. Now there is no power at all not even for the lights. Where should I start looking? You may (probably) still have corrosion inside the fuse holder on the electrical contacts Although a direct short will take out a 30 amp fuse, the fuse element will blow or vaporize instantly. If the fuse body has melted, this indicates PROLONGED high temperatures near the fuse body, most likely from a high resistance in the fuse socket. The heat formed by the current running thru a resistance in the socket heats the socket and melts the fuse. Remember, a 50 watt soldering iron can generate 700+ degrees and draws less than 1 amp of current. So its not likely a simple overcharge issue will melt the fuse. Recheck the fuse holder terminals. Edited April 30, 2014 by Save Old Iron 3 Share this post Link to post Share on other sites
