FineLineIDI
Registered User
Hey guys, I've been helped a lot just reading and researching on here maybe you could help me out with this.
Basic question: Transmission is not shifting, ODO light stays on, RPM gauge and tachometer not working all happened at the same time after mechanic worked on electrical system (battery, alternator, voltage regulator, and starter relay)
Back story:
I've got a 91 f250 7.3L IDI. A few weeks back it failed to start after work due to the glow plug relay just clicking and not sending power to heat the cylinders. The next morning the truck's batteries were completely dead. Towed it to a shop where they replaced the alternator and one of the batteries and said they fixed it. A week later the batteries were completely dead again. the guys replaced the external voltage regulator and the ignition solenoid (or starter relay mounted on the passenger side fender) and the charging issue went away.
When I picked up the truck I noticed the RPM gauge was not moving at all, the ODO light was stuck on whether i pressed the button or not, and the transmission seems to be in some kind of fail safe mode where if it is in drive it doesn't shift at all as you accelerate. like it is in constant overdrive or 4th gear or something. It shifts into reverse park and neutral fine. In low one and two it has more power at low speeds but in drive it the engine revs but accelerates like a snail.
The mechanic who worked on it wouldn't even acknowledge there was an issue with the trans.
Took it to an aamco. they said it had something to do with the powertrain module and it looked like the wires of the harness going into the cab were corroded but on my inspection they
The Glow plug relay at this point began to keep clicking and not work at all so I checked it out and the terminals and connections were all burnt up so I replaced the solenoid and all the glow plugs but it is still doing the same thing.
I know somehow all this electrical stuff is related and I was wondering if anyone has experienced a similar problem or has the knowledge of this truck's electrical system to help me out.
Thank you!
Basic question: Transmission is not shifting, ODO light stays on, RPM gauge and tachometer not working all happened at the same time after mechanic worked on electrical system (battery, alternator, voltage regulator, and starter relay)
Back story:
I've got a 91 f250 7.3L IDI. A few weeks back it failed to start after work due to the glow plug relay just clicking and not sending power to heat the cylinders. The next morning the truck's batteries were completely dead. Towed it to a shop where they replaced the alternator and one of the batteries and said they fixed it. A week later the batteries were completely dead again. the guys replaced the external voltage regulator and the ignition solenoid (or starter relay mounted on the passenger side fender) and the charging issue went away.
When I picked up the truck I noticed the RPM gauge was not moving at all, the ODO light was stuck on whether i pressed the button or not, and the transmission seems to be in some kind of fail safe mode where if it is in drive it doesn't shift at all as you accelerate. like it is in constant overdrive or 4th gear or something. It shifts into reverse park and neutral fine. In low one and two it has more power at low speeds but in drive it the engine revs but accelerates like a snail.
The mechanic who worked on it wouldn't even acknowledge there was an issue with the trans.
Took it to an aamco. they said it had something to do with the powertrain module and it looked like the wires of the harness going into the cab were corroded but on my inspection they
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were a little dirty but i didn't see any corrosion. The Glow plug relay at this point began to keep clicking and not work at all so I checked it out and the terminals and connections were all burnt up so I replaced the solenoid and all the glow plugs but it is still doing the same thing.
I know somehow all this electrical stuff is related and I was wondering if anyone has experienced a similar problem or has the knowledge of this truck's electrical system to help me out.
Thank you!