Speedo quit working shifting hard

Sheps7864 · Sep 4, 2018

2000 ranger 3.0 automatic 2wd 194,xxx miles...was driving the other day and we stopped at a gas station left the truck running got out and came back as soon as we started moving the od off light started flashing check engine light came on. the speedo doesnt work at all, trans shifts hard into gears and the windows wont roll up or down. The headlights still work and dash lights as well. Found a fuse in the box had ruptured it was the a4lde od trans/backup lamps/drl fuse. Replaced it and it immediately blew with truck off. Where should i begin to look?

ericbphoto · Sep 4, 2018

Something in that circuit is shorted to ground. Here is something you can do without a meter.

I would find a connector near the daytime running lights (DRL) and unplug it. Same with the backup lamps. Then replace the fuse and see if it blows. If it does not, start the truck and drive it a little bit to see if transmission acts right and to make sure fuse still does not blow. Then reconnect either the backup lights or the daytime running lights. If fuse blows, that is the bad circuit. If fuse stays good, energize whichever ones you reconnected and make sure fuse doesn't blow. Then do same for the last circuit if necessary. Once you get it narrowed down to just one of those circuits, check the wiring and bulbs and lamp holders for that circuit. Somewhere a wire is rubbed through or a light is full of water or something making it pull too much current.

Have you recently added trailer wiring? If so, I would start with the backup lights circuit somewhere near where the trailer wiring was added.

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Sheps7864 · Sep 9, 2018

ericbphoto said:
Something in that circuit is shorted to ground. Here is something you can do without a meter.

I would find a connector near the daytime running lights (DRL) and unplug it. Same with the backup lamps. Then replace the fuse and see if it blows. If it does not, start the truck and drive it a little bit to see if transmission acts right and to make sure fuse still does not blow. Then reconnect either the backup lights or the daytime running lights. If fuse blows, that is the bad circuit. If fuse stays good, energize whichever ones you reconnected and make sure fuse doesn't blow. Then do same for the last circuit if necessary. Once you get it narrowed down to just one of those circuits, check the wiring and bulbs and lamp holders for that circuit. Somewhere a wire is rubbed through or a light is full of water or something making it pull too much current.

Have you recently added trailer wiring? If so, I would start with the backup lights circuit somewhere near where the trailer wiring was added.

This message composed solely of recycled electrons. Go green!

I finally got to look into it again..this fuse is supposed to run DRLs, overdrive, and back up lamps. This vehicle doesn't have DRLs and the backup lamps work fine..also discovered the wipers dont work tonight. Checked radio and cig lighter etc...all works except speedo windows and wipers. Truck runs fine the od light doesnt turn on and flash until it shifts into 2nd the first time after starting. I dug through every wire i could find and found nothing. Could it be an ecu issue? Remember all of this happened at the exact same time.

ericbphoto · Sep 9, 2018

It sounds like you have several issues. The speedometer and OD might be related through the PCM. Did you replace that fuse again? If so, did it stay good or blow immediately?

The windows and wipers would be other circuits.

I did some digging. But I haven't found diagrams yet that I feel positive are for your truck.

Sheps7864 · Sep 9, 2018

The fuse blew immediately when i replaced it. Thats why i was wondering about the pcm because all of it happened together the same day..never diagnosed a pcm issue.

ericbphoto · Sep 9, 2018

You mentioned ECU earlier. I would think PCM and not ECU in this case. Unfortunately, I don't have much experience with the PCM to share with you. My vehicles have been too old and prehistoric for that.

This message composed solely of recycled electrons. Go green!

Speedo quit working shifting hard

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