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Matt
Matt, Mechanical Engineer
Category: Mitsubishi
Satisfied Customers: 20577
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a Mitsubishi Shogun 3.5 DTI Evolution (the rally

Customer Question

I have a Mitsubishi Shogun 3.5 DTI Evolution (the rally version) I have only had it a couple of months. When I got it the dash lights were cycling bright and dim in time to slight variations in engine revs. At night the headlights were also cycling bright and dim in time. The voltage across the battery at idle measured 14.8 volts dipping to 14.5 volts in time to the dash lights etc. The battery light did not come on at all neither when turning ignition on or when running.
I managed to source a new alternator from a specialist supplier. I have put it on the vehicle. I get 12.6 volts across the battery whether the engine is running or not. The alternator has a four pin connector. I get 12.6V on both the centre pins. I have checked the battery bulb and it is good. The battery light comes on when the engine is cranking but is off before the engine is cranking and fter it starts.
Any ideas how I can check the new alternator is OK or whether the vehicle wiring has a problem?
I dont want to do any damage to either!!
Submitted: 4 months ago.
Category: Mitsubishi
Expert:  Shantal-Mod replied 4 months ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
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Shantal
Customer: replied 4 months ago.
Can you please continue to investigate thankyou Alan
Expert:  Shantal-Mod replied 4 months ago.
Hello,
Thank you for getting back to me and apologies that you have not received an answer yet. We have a range of Professionals online all the time. However specialties differ, and we are searching for the right professional to assist you.
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Expert:  Matt replied 4 months ago.

Hello

as this is a modern 'smart' alternator the current control is run by the ECU but the testing of it all is a bit more involved

see here for a detailed description

https://www.picoauto.com/support/topic8174.html

I suspect that something is wrong either with the ECU controlling the current, or the earth connection between the ECU and engine or its the wrong spec of alternator

if you find where the small earth wires are fixed to the engine and then run back into the main wiring loom as these are the ECU specific earth paths and used to control supplementary function like this

Expert:  Matt replied 4 months ago.

Hi

do you still need help?

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