Question about 1989 Buick Riviera

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Engine elec prob.

Dont know computer says engine electrical problem,blower comes on and runs the battery down,ruin the battery and the alternator, kids got in and turned the radio on while on charge fried the diodes in the alternater which caused me to over charge the battery because alternater wasnt.

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You probably need to change the blower motor relay. Check your fuse box diagram to see if it's in the fuse box. Disconnect the negative battery cable before replacement.

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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Hi Donald,

It sounds to me like your alternator decided to give up the ghost. The battery did not have any voltage because there was probably just barely enough power to get the engine started. Then when the voltage got low enough, your onboard computers could no longer function properly and the engine died. However, the battery continued to discharge because the ignition switch was on and all of the systems were still TRYING to operate. Yes, this will cause the entire electrical system to shut down....No battery power causes everything to stop operating. Without the alternator, there is no way for the battery to get recharged.

What you must do is to recharge the battery and test it to make sure it is not dammaged or shorted. Also relace the battery if it does not test good when it is fully charged (many times, a shorted battery cell is what causes an alternator to go bad). The alternator is definately not working, because it would have kept the engine running even if the battery was bad.

In short, you need to replace your alternator and possibly also your battery.

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2. Now start the car and turn all accessories off and check the voltage level. It should be between 13.5 and 15.1 volts. (depends on your make and model of car) It is a good idea to write down all voltage readings your taking. The main thing your looking for is a drop in voltage. Once you hit around 12.5, your alternator is not going to produce any additional amperage.

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