Question about 1989 Chevrolet Suburban

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Keep blowing the 20amp fuse for gauge/idle when this happens all the gauges quit woking and the alternator stops charging the battery. this is on a 1989 suburban 5.7

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1996 blazer blowing fuse that goes to the charging guage

Posted on Aug 29, 2011

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Fuel filter is probably plugged and is blowing the ecm fuse because of too much draw from fuel pump. replace filter, then fuse.

Posted on Aug 28, 2009

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The system has a short circuit, check for a broken wire

Posted on Jul 29, 2009

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Well I looked at the wiring diagram and I did not see a 30amp fuse.
There is a 15amp, a 7.5 amp, and the two fuseable links between the battery and the alternator. Thats not to say a 30amp fuse for the charging system does not exist, but its not in the standard diagram.
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If it don't feel the charge...the light comes on.
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SOUND LIKE DEAD BATTERY.HAVE BATTERY CHECKED AND REPLACED.MAKE SURE ALTERNATOR CHARGING BATTERY.WITH ENGINE IDLING BATTERY VOLTAGE OUTPUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS,CHECK ALTERNATOR FUSE AND MAKE SURE ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING OR BROKEN.

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depending on how new your truck is you may not be able to disconect the battery and keep it running there are just so many electrical things in cars now adays that the altnator alone just cant keep up with every thing at idle you may want to go to a local scrap yard and get a whole dash cluster or check all your fuses again first

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You either have a short somewhere, or the alternator is over charging. What does the volt gauge read before it blows, if you don't have a gauge, get a volt meter and test at the battery. Anything over 14.5 will blow the link.

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Charge the battery to full. Start engine and apply voltmeter to battery posts. Reading should be 13.5-14.5 volts runing. If you read normal battery voltage then alternator is not charging. Check all fuses with test light. Power on both sides of same fuse o?k. Power on one side and not the other burnt fuse. Sometimes when looking at fuses they seem o/k. If they burn close to one end it can be difficult to see. Suggest using test light to be sure. There is a gauge fuse in the system and if it goes it stops power to the regulator on the alt. Hence "no charge" Hopr this helps

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