Troubleshooting electrical problems
From Crankshaft Coalition Wiki
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==Cleaning terminals== | ==Cleaning terminals== | ||
| − | Start at the battery. Regardless of how the connections look, remove the cables. Remove the | + | Start at the battery. Regardless of how the connections look, remove the cables. Remove the negative cable first, then the positive cable. Removing them in the opposite order will cause arcing if there is any charge in the battery. Use a battery terminal wire brush tool to clean the battery terminals and the cable terminals. Remove all old oxidized contaminants. Be aware that lead is likely present, so wear gloves if you are concerned about lead migrating through your skin. |
To prevent future corrosion, a light coating of non-conducting grease such as Dow Corning DC4 should be applied. While a professional might not recommend this, I had Japanese mechanics put regular bearing grease on my car battery terminals when I was overseas and it never presented a problem. It seemed to prevent acid build up and corrosion. | To prevent future corrosion, a light coating of non-conducting grease such as Dow Corning DC4 should be applied. While a professional might not recommend this, I had Japanese mechanics put regular bearing grease on my car battery terminals when I was overseas and it never presented a problem. It seemed to prevent acid build up and corrosion. | ||
Remove the other end of the battery cables and clean those terminals and where they mount with a wire brush. Make sure you see shiny bare metal. Again a light coating of non-conducting grease would be optimal, but not mandatory. | Remove the other end of the battery cables and clean those terminals and where they mount with a wire brush. Make sure you see shiny bare metal. Again a light coating of non-conducting grease would be optimal, but not mandatory. | ||
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| + | ===Battery terminals=== | ||
| + | [[File:Bad batt clamp term.jpg|thumb|220px|left|Clamp-on replacement battery terminals are to be avoided!]]Do not be tempted to save money by using one (or more) of the cheap, clamp-on style battery cable terminals. Even if they are tight and look fine, all too often they will cause high resistance and can make it seem like the battery is bad, etc. If the terminal fails on a cable there are better terminals that may be used to replace them, or the entire cable can be replaced with a cable having a larger diameter and quality terminals already installed. | ||
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| + | A much better option is to use one of the collet type terminals like is now sold by Accel, shown below. They have a much better retention method than the type shown above. | ||
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| + | [[File:Accel bat term.jpg|thumb|left|450px|Accel 1/0 battery terminals with positive retention]] | ||
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| + | Another option is to use an eye terminal sized to the cable, attached to a marine type terminal that has a lug and nut to hold the eye terminal in place. | ||
| + | *[http://www.noco-usa.com/pdf/Noco-Catalog-Terminals-Lugs.pdf Noco terminals] | ||
| + | *[http://www.summitracing.com/parts/acc-1860 Accel terminals] | ||
==Grounding== | ==Grounding== | ||
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==Cable inspection== | ==Cable inspection== | ||
| − | Look your battery cables over very well for signs of problems. Sometimes you will see a green color on the wire somewhere. This is corrosion of the copper and is called verdigris. It is similar to rust on steel. This is a sign you may need to replace the cable if it can't easily be removed. Even if you can clean it, the corrosion may have traveled up under the insulation and would likely eventually cause problems if it's not already degrading your cable's ability to carry current. | + | Look your battery cables over very well for signs of problems. Sometimes you will see a green color on the wire somewhere. This is corrosion of the copper and is called verdigris. It is similar to [[rust]] on steel. This is a sign you may need to replace the cable if it can't easily be removed. Even if you can clean it, the corrosion may have traveled up under the insulation and would likely eventually cause problems if it's not already degrading your cable's ability to carry current. |
Battery cables are cheap. Yes, they can be a pain to change in some instances, but changing them when you can in a controlled environment might save you from being broken down on the road in bad weather. | Battery cables are cheap. Yes, they can be a pain to change in some instances, but changing them when you can in a controlled environment might save you from being broken down on the road in bad weather. | ||
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Considering that electrical fires happen all too often and our classics deserve to be protected, a new wiring harness should be considered in most cases. Aftermarket companies are making some very nice kits and some are car or class specific. | Considering that electrical fires happen all too often and our classics deserve to be protected, a new wiring harness should be considered in most cases. Aftermarket companies are making some very nice kits and some are car or class specific. | ||
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| + | ==Ignition system== | ||
| + | *[[Troubleshooting ignition]] | ||
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| + | ==Resources== | ||
| + | *[http://www.danielsternlighting.com/home.html Daniel Stern's excellent page on headlight relays, voltage drop, etc.] | ||
| + | *[http://www.archtoolbox.com/representation/abbreviations/99-electabbrev.html Electrical abbreviations] from archtoolbox.com | ||
| + | *[http://www.vernco.com/Sparks/id606.htm Voltage drop test] | ||
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| + | *Crankshaft Coalition wiki articles: | ||
| + | **[[How to solder electrical connections]] | ||
| + | **[[Understanding the math of electrical loads]] | ||
| + | **[[Wiring diagrams]] | ||
| + | **[[Remote Ford solenoid for GM- no hot start]] | ||
| + | **[[Relay application guide]] | ||
| + | **[[How to solder electrical connections]] | ||
[[Category:Electrical]] | [[Category:Electrical]] | ||
| + | [[Category:Troubleshooting]] | ||
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