Tip & How-To about Smart Vehicle Parts & Accessories

CAR or TRUCK discharges while driving down highway

WARNING NEW CAR AND TRUCK OWNERS: Most these vehicles have what is called a Smart Alternator (actually, needs new design). When traveling for some distance on the highway the computer will switch off the alternator and the battery will begin to slowly discharge (lights and all on) and this is used to save torque on engine and thus some gasoline. Look close, on your volt meter and you should see a RED DOT that this discharge "should not" go below. If it by chance it does, then pull over stop, count to 10, restart car/truck and keep fingers crossed. Again, I think the system should "trickle charge" if nothing else.

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Changed bcm any ideas

I do like your approach...

Changing out the entire BCM is not subtle...!!!

If you plan on keeping the vehicle (un-identified)... It will allow you plenty of good spares... and you will still come out cheaper than taking it to the shop (owners simply break fewer things)...


The NEW Body Control Module... needs to be profiled to
the specifics of your vehicle (make/model/year.. WOULD ALLOW BETTER SPECULATION)

If/When you get an OBD reader... and start checking your registered codes... you can NARROW down the number of inappropriate spares... in favor of THOSE you may actually need...

Try to get an OBD READER (writer) that will allow you to actually "option" your vehicle specifics ... into the new BCM.

Just to make your choices more difficult.. they have PC based apps... and now BLUETOOTH APPS for those smart phones.

Just try to remember... when you are "WRITING" things into your
vehicles MEMORY... You would be VERY WELL ADVISED to know what you are doing... (I'm just saying).

Good luck...

May 29, 2016 | Cars & Trucks

3 Answers

battery goes dead overnight on four occasions

I dont think the dealer knew what he was doing ,your altenator has 6 diodes inside it and the are a one way check valve for current,If one fails no light will come on because it is still charging,But will drain your battery,I hope this helps you and have a merry x mas and please dont forget to vote on this solution

Dec 19, 2009 | 2009 Hyundai Genesis

1 Answer

Warning lights

Feel safe about your trip as this a only warning lights that some issues are at hand concerning your car, it does not mean you can not travel 1000miles.

Just take your car for a scan and it will all be corrected.

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Apr 10, 2009 | 2002 Oldsmobile Alero

2 Answers

What is a generator belt and how much does it cost to get fix?

Could be as simple as adjustment if no air conditioning on vehicle. Little more work if it does have A/C. Worse case scenario, it's not the belt but alternator/generator. Check belt condition & tension & go from there.

Dec 22, 2008 | 2002 Nissan Sentra

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