Isuzu Trooper Alternators keep going bad

28 messages, Last post on Mar 31, 2009 at 4:08 AM

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#27 of 28 86 trooper charge problem by izzbo1 Mar 30, 2009 (1:14 pm)
I have an 86 trooper I just bought yesterday. brake and alternator warning lights are on intermittantly when running. When they are on, my tester says the alternator is only putting out 11 volts. When/if they go off, my tester says it is putting out 14 volts. Supposedly the alternator was JUST rebuilt (days ago). Is tthis simply an alternator problem or could it be something else in the system? how can I track it down? Thanx Replies to this message: atfdmike (Mar 31, 2009 4:08 am)
#28 of 28 Re: 86 trooper charge problem [izzbo1] by atfdmike Mar 31, 2009 (4:08 am)
Replying to: izzbo1 (Mar 30, 2009 1:14 pm) It sounds like a bad alternator to me. Even fresh out of the box, some alts are not right. There are diodes in the alt that can be bad and the alt will still test as OK. Getting a quality rebuild on the alt is generally necessary.....cheap ones don't seem to hold up or work at all in many cases. Your year has two style of alt....one with IC regulator built in.....one outside. If your voltage regulator is outside, that is likely the cause.....otherwise, you seem to need to replace the alt. Make sure though, that the ring terminal on alt is not close to or grounding on alt case. Very commom problem when installing and tightening terminal nut. If it is OK, then above would apply. Part nos. at www.myisuzuparts.com HTH One guys opinion