Common Starting Issues in Trucking Applications---Part 3
Alternator
If your batteries were not at full charge, your alternator capacity may not be up to the needs of your rig. How old is it? A standard brushed alternator is good for 100-150,000km, a long brush alternator up to 300,000km and we have seen brushless alternators last for over a million kilometres. You get what you pay for. Also if you’re hauling more than one trailer or have additional lighting or other load on your electrical system, the standard alternator output may not be sufficient to run your truck and adequately charge your batteries. Providing you have a quality brand alternator, you can trust the claimed output, and your auto electrician should be able to work out your requirements. If your alternator is running at or near capacity just to run your truck, there’s a fair chance it’s not getting the chance to charge your batteries between starts. But remember, before you invest in a high output alternator, check the wiring for size. Most truck manufacturer’s use the narrowest cable they can get away with so there’s a chance your new high output alternator may be wasted on undersized cabling.
Wiring
It is amazing how many electrical problems are caused by simple wiring issues. Undersized cable is often at fault, or it can be poor quality or corroded terminals. Remember any voltage drop over half a volt is a problem. Finding voltage drop is easy and fixing it is often just a matter of increasing your cable size.
Battery Switch
Battery master switches are common in many heavy duty applications and intelligent battery switches and rollover devices are mandatory in fuel haul vehicles. The quality of the battery switches in the Australian market varies wildly, and we have seen switches with well over half a volt of voltage drop across the terminals. Look for a quality battery switch with less than 0.1V voltage drop across the main contacts.
Tips from:http://www.dieselnews.com.au
