mschultz373
Member
- Joined
- Mar 11, 2020
- Location
- dirty coast
i am (was?) planning on a 10hr drive tomorrow, so I was checking out my 85 240 to make sure everything was a go. fluids, etc. this was only a few hours ago, and my battery cold was around ~12.4V, idling was ~14.4V. so everything was checking out.
i wanted to get a quart of oil to be safe, so I drove the autozone - all good. get back in my car, start driving to go get the tires filled, and i notice my transmission overdrive is 'on' - which, i had not chosen to engage - and the battery light in dash is on. none of my running/brake/hazard lights were working. i turn off overdrive and drive home.
my battery voltage with car running was ~12.2V. so alternator was not charging. battery cold was ~12.5V. checked the alt and all the wiring to it is good. so I check the fuses, and fuse #9 and 13 are blown:
9 = hazard warning lights
13 = instruments, turn signals, fuel injection system relay
so i replace the fuses. currently, everything appears to be working normally and looks normal on the dash. but my battery is ~12.4V cold, and 13.77V running. so my suspicion is - my alternator is going out?
But my lingering question is - why did fuse 9 and 13 blow? and what would've caused all this to happen, and why would my alternator suddenly be crapping out? how could it go, in a matter of hours, from a totally fine reading to a below-spec reading?
i wanted to get a quart of oil to be safe, so I drove the autozone - all good. get back in my car, start driving to go get the tires filled, and i notice my transmission overdrive is 'on' - which, i had not chosen to engage - and the battery light in dash is on. none of my running/brake/hazard lights were working. i turn off overdrive and drive home.
my battery voltage with car running was ~12.2V. so alternator was not charging. battery cold was ~12.5V. checked the alt and all the wiring to it is good. so I check the fuses, and fuse #9 and 13 are blown:
9 = hazard warning lights
13 = instruments, turn signals, fuel injection system relay
so i replace the fuses. currently, everything appears to be working normally and looks normal on the dash. but my battery is ~12.4V cold, and 13.77V running. so my suspicion is - my alternator is going out?
But my lingering question is - why did fuse 9 and 13 blow? and what would've caused all this to happen, and why would my alternator suddenly be crapping out? how could it go, in a matter of hours, from a totally fine reading to a below-spec reading?