Question about 2003 Isuzu Rodeo

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I've replaced the battery and the alternator on my 2003 Isuzu Rodeo. But when traveling for several hours with headlights on the battery will go dead and the alternator won't charge till it cools off. Another symptom is that the headlights vary in intensity with the speed of the engine.

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Get a beck arnly alternator the zone alternators will fail.

Posted on May 14, 2010

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I replaced alternator and belt on my 1993 isuzu rodeo and no the only thing that works is headlights nothing else i turn key and nothing what could the problem be


Did you disconnect the battery before removing the alternator? Have you checked the fuses for one or more that may be open?

Nov 21, 2016 | Isuzu Cars & Trucks

1 Answer

2003 rodeo remote won't unlock or lock


car came with 2 fobs (fobs dead to car door?)
you left out the noun for what (DOORS)
all fobs dead. right.
if yes, 1 or both are dead we change the batteriers first.
in the fobs. unless $1000 in car electronics is cheap to you.
or labor fixing that....
the batteries, are like 1 buck.

after market remote starter?
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May 28, 2015 | 2003 Isuzu Rodeo

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How do I replace an alternator in a 1996 v6 isuzu rodeo


I'll confirm what LegendLB said about the remanufactured alternators. I installed a reman into my '96 Isuzu and it did not work. The brake + battery light combo was still on. I haven't installed a new alternator yet, it will arrive in a week.

Jan 31, 2012 | 1996 Isuzu Rodeo

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I am having a problem with the voltage system in the Rodeo I just bought. We replace the Alternator and Battery with new ones yesterday and still today the same problem occurs and it will not run unless...


Isuzu Rodeo Recalls Rodeo ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR Recall - ID# 31705 Recall Date MAR 07, 1997 Part Affected ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR Model Affected RODEO Potential Units Affected 118485 Get Details Recall Date MAR 07, 1997

Model Affected 1994 ISUZU RODEO

Description AN INTEGRATED CIRCUIT WITHIN THE VOLTAGE REGULATOR CAN CONTAIN MANUFACTURING ERRORS.

Consequence THIS CAN CAUSE EXCESSIVE ELECTRICAL CHARGING OF THE VEHICLE'S ALTERNATOR, RESULTING IN ENGINE CONTROL MALFUNCTION, AND/OR EVENTUAL ENGINE STALL.

Remedy DEALERS WILL REPLACE THE VOLTAGE REGULATOR WITH A NEW REGULATOR.

Potential Units Affected 118485

Notes ISUZU MOTORS LIMITED

Dec 14, 2010 | 1994 Isuzu Rodeo

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I've replaced the battery and the alternator on my 2003 Isuzu Rodeo. But when traveling for several hours with headlights on the battery will go dead and the alternator won't charge till it cools off....


Sounds like there's still something wrong with the charging system. Did you verify alternator output?
(Volts/amps) Should charge at about 13.5 - 14.5 volts when engine at medium idle. About 65 amps w/o a/c, about 85 amps with a/c. If you've got the non a/c alt in a vehicle with a/c, amps falling short may cause intermittent charging/problems.

Does engine exhaust leak blow on alternator? Had this symptom before-it can ruin your alternator also.

Battery going dead-either the battery won't HOLD a charge or the alternator is not charging it. One or the other is your problem. Verify alternator output as described earlier, then need to do a LOAD test on the battery with a full charge.

Hope this helps.

Mar 19, 2010 | 2003 Isuzu Rodeo

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1997 Isuzu Rodeo 2wheel drive. Repalced


Get a Beck Arnley alternator. The auto-zone, Napa etc. alternators are a problem for Isuzu's. I worked at a dealership and a lot of them came in for this problem. If you still have the original have it rebuilt. Check yellow pages.

Apr 25, 2009 | 1997 Isuzu Rodeo

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