TTAC commentator Derek writes:
My wife and I purchased a low mileage (50k, now at 70k) 2002 Dodge Grand Caravan two years ago when our fourth came along. We understand that the Siennyssey twins boast better build quality, but we didn’t have to finance the Dodge. Plus, we figured that Dodge had been building the Caravan long enough that they had worked out most of the larger Q/A issues. So far that appears to be true. However, there is one issue we’ve witnessed that I don’t understand. Every now and then (once a month or so) all power will momentarily cut off while the engine is running.
Usually, this will happen as I’m backing out of the drive. In that situation, the power steering will cut out for a few seconds and then kick back on—not a big deal. On the other hand, about a year ago we were headed east on I-90 around dusk. We were traveling at 70 mph with the van set on cruise, when the cruise cut off, the headlights when out, and the dash went blank. Disconcerting. I remember about a year ago (before the Piston Slap series) there being a post on TTAC where folks were discussing the large demands on electrical system in modern vehicles. And how the increased demand has led to some failure. Is that what is happening here?
The battery is no longer the original, but I’m guessing the alternator is. Any ideas of what could be causing the problem?
Sajeev answers:
I see three areas of concern: the ignition switch is losing its marbles, a major component in the charging system is taking a dump, or battery cables are slipping off the battery terminals. Or perhaps the cables are attached so tightly they cracked the terminal inside the battery: that’s always a fun one.
As per usual, The Best and Brightest are right: modern cars have high electrical demands. And today’s multiplexed wiring harnesses mean that a weak battery or dying alternator causes spastic behavior that makes you think your vehicle is possessed. Luckily, parts stores test entire charging systems with a tool they roll out to the parking lot: no greasemonkeying needed. The test is accurate and 100 percent free. Give it a shot.
Bonus! A Piston Slap Nugget of Wisdom:
If the alternator is bad, don’t buy a lifetime warranty unit from a parts store. Do anything to get a NEW (not remanufactured) alternator. While I’ve heard lifetime warranty alternators finally changed their evil ways, I’ve dealt with units that failed after six months of use. And left me stranded in not-so-happy places. Consider me scarred me for life.
On the plus side, now I can change my alternator in my sleep, so going back for a new one during an oil change isn’t a big deal. Not that I would . . . but I could.
Source: www.thetruthaboutcars.com
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