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Isuzu Trooper Alternators keep going bad

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

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What is this discussion about? Isuzu Trooper, Isuzu Trooper II, SUV

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#23 of 28 Re: Trooper not starting [kayreen] by atfdmike Mar 07, 2009 (8:39 am)
Replying to: kayreen (Mar 07, 2009 3:27 am) One way to determine if it is the alternator on a Trooper is to see if the heater/AC blower turn on while the engine is running. If it does not, then it is alternator. Japanese wired the system so if alt quits, most unnecessary accessories don't work. The alt is mounted in the worst place,down low on engine, not hard to change but it is exposed to water from splashing and mud since it is so low. Usually not a problem unless you go offroad or are in mud and rain a lot. There is a shield on it, but it is not very big. If the engine starts, the indicator lights often light up illogically if it is the alternator too. Brake warning, ABS, etc light up too. Rebuild alts are fine if OEM or Bosch. Still not cheap, but at least they work right with Isuzus. HTH one guys opinion. Replies to this message: kayreen (Mar 07, 2009 1:32 pm)
#24 of 28 Re: Trooper not starting [atfdmike] by kayreen Mar 07, 2009 (1:32 pm)
Replying to: atfdmike (Mar 07, 2009 8:39 am) Many thanks for that, my AC/Heater does not come on right away I have to wait a while before it comes in. Had a look at the terminal on the alternator and a wole load of rusty mush came out. I suspect that it is the problem. We have wet cold here in Scotland!! Many thanks again. Will change it. Cheers Kayreen
#25 of 28 Re: Trooper not starting [kayreen] by bushwacker1 Mar 08, 2009 (10:21 am)
Replying to: kayreen (Mar 07, 2009 3:27 am) I had the same issues: replaced starter first then battery & all cables.... worked for a white then it rained and my RELAY SWITCH blew. I replaced it & the alternator and have had no problems since. NOTE: My Trooper sat for days on end and still started up NOTE: I have since given it to my nephew in college and back hills bike riding and it continues to start right up. Replies to this message: kayreen (Mar 08, 2009 11:34 am)
#26 of 28 Re: Trooper not starting [bushwacker1] by kayreen Mar 08, 2009 (11:34 am)
Replying to: bushwacker1 (Mar 08, 2009 10:21 am) Many thanks I am going to replace the alternator!! I cannot have it deciding when to go and not go!! Best wishes Kayreen
#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

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