You are here:

Automotive/electrical problems and fuel economy

Advertisement

Expert: - 5/16/2007


Question
I have a 1999 Ford Expedition and I have problems with my odomeder light going on and off and sometimes I have problems with the auto locks not working or lights that come on or wont go off. Also my horn doesn't work. My other question is about those supposed fuel savers like the Turbonator, do they really work? Thanks.  

Answer
Intermittent electrical connections almost always come down to corroded connectors and/or wiring that has been mechanically damaged.  If the symptoms appear to be wide spread, then the problem most likely is one affecting a main power bus.  

Visual inspection of wiring would be in order, along with opening connectors to inspect the contact points.  Damaged wiring can be repaired by competent soldering and the use of epoxy-lined heat-shrinkable tubing; if you have good skills in this area, feel free to proceed.  If the damage involves a lot of wire, you would probably do better to build a new harness out of appropriately sized and specified wire, or get a replacement in good condition from the wreckers, or simply buy new.

Connectors showing burn damage - pitted contacts and/or charred insulators - must be replaced.  Connectors that are oxidised only can be cleaned and should be regreased using a non-conductive electrical grease before being reassembled.

On the matter of after-market "easy solutions", I say the following without prejudice to the product to which you refer or to any to which anyone may refer: I do not take the time to pay any attention to the bulk of them, which I tend to dismiss as so much "snake oil".   Engineering is engineering, and to take the time to learn and understand the basic principles will provide the most meaningful approach to maintaining and optimising engine and vehicle performance.

Best regards ... EGK

Automotive

All Answers

Answers by Expert:

Ask Experts

Volunteer

Ernest (Ernie) Kenward

Expertise

The challenges I most enjoy are thoughtful technical questions of a trouble-shooting nature in both electrical, power electronic and mechanical systems, mainly automotive but also machine control and small-machine PLC applications. Please note, however, that I am NOT a walking shop manual! I DO, however, make it a point to have those manuals and other service literature for those vehicles I DO own, and highly recommend that anyone serious about maintenance or modification of their vehicles do the same; MOST of your answers WILL be found there. For that matter, I do NOT go out of my way to acquire shop manuals for any vehicle I do NOT own! That being the case, any general query to me along the lines of "What is the meaning of this code read from the ECU of my 2015 XYZ?" or "Where is the fuse for the windshield washer pump found?" (try your car's electrical distribution panel for a start!) will not go far. What I do offer is a pretty good collection of literature, insights and hands-on experience with 1950s to 1980's Ford products (plus a developing database of information and practice with the Mercedes diesel cars), along with an engineering perspective and the ability to design and implement custom control, electrical and mechanical subsystems for vehicles. For that reason, I am happy to make my thoughts and efforts available to those who are of like mind and/or are seriously making a point of learning about their vehicles. Use the Opportunity to Learn!

Experience

A key skill in my work and hobby pursuits both is STRATEGIC TROUBLESHOOTING. I am a senior instructor in Electrical Engineering Technology at a leading Canadian polytechnic, my areas being Electrical Power and Industrial Control, electrical and electronics design and manufacturing, and AutoCAD and related CAD/CAE software - plus equipment problem-solving and new equipment design and prototyping. Hobby-wise, I have 30-plus years of experience in auto restoration, mostly in electrical and mechanical systems. Ongoing projects include a 1959 Edsel Corsair, my 1978 Ford E250 class-B motorhome conversion, and the care and upkeep of my Mercedes 300CD. My vehicles become engineering test beds for electrical and mechanical upgrades as ideas present themselves. This includes the design and production of circuit boards to restore or enhance features for which no OEM replacement parts are obtainable, or where better specifications or reliability can be had via newer concepts. Regarding the E250 RV conversion, I designed and continue to revise a custom power distribution system, managed by a Programmable Controller (PLC); this has made most revisions as easy as uploading new firmware as I develop it. The "mini" PLC is a powerful device for custom automotive control systems. One good example (there are many) would be the Moeller "Easy Relay"; these offer a wealth of control, monitoring and variable-and-status display options for such projects. A good example project which has worked well is that one for my RV noted above, which has been on the job - revised in firmware only - for a decade now. It is a load management and charging control system to avoid the sulfation-induced early failure that often befalls deep-cycle batteries used in RV power applications. The battery installed in 2003 lasted long enough to more tnan pay for the PLC that contributed to its longer life ... and the PLC will be there for the next battery as well!

Organizations
IEEE - senior member ... past WCC Student Activities; SME - senior member ... past chair, greater Vancouver chapter chair 318; Edsel Owners' Club - have served in various capacities on chapter executive during seventies; have been Power and Driveline resource on the Edsel Owners' Club "E-team" for more than a decade.

Education/Credentials
Graduate of UBC

Awards and Honors
Certificates of appreciation from IEEE and SME for work in student and chapter activities

©2012 About.com, a part of The New York Times Company. All rights reserved.