Charging system

ANN EDWARDS

MEMBER
2010 NISSAN PATHFINDER
30,000 MILES

Engine stopped battery 12.2 volts start engine 14.2 volts fully loaded lights, A/C everything reading the same soon as engine revs 2000 reading drops to 13.05 volts same reading with everything on or off hence cuts out relay for caravan fridge had same problem for eight months thought it was relay.

3 Replies

HMAC300

MECHANIC
48,601 POSTS

There is a CPU that controls this system so scan for codes. Also, check the pulley to see if it loose on alternator because that is one of the problems with this and if that is it you need to replace the alternator. The belt must be off to check pulley.

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Monday, June 19th, 2017 AT 7:06 AM

ANN EDWARDS

MEMBER
2 POSTS

Thanks you are the first person to say do not remove alternator and get tested cannot find any serial numbers sounds like CPU do you think the problem is where the relay was wired into the rear power outlet? It states in handbook not to use with accessories that exceed a 12 volts 120w 10a power draw and also avoid use with A/C headlights or rear window defogger are on. It also states bad contact at the plug may overheat or the internal temperature fuse may blow got new caravan had tracker fitted could this be extra draw found a 20a fuse which should b 15a power outlet fuse in fuse box many thanks

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Tuesday, June 20th, 2017 AT 10:28 AM

HMAC300

MECHANIC
48,601 POSTS

Well that may be the cause due to higher than what is supposed to especially if there are warnings with that. However, one thing I did not catch was you said battery was a 12.2 volts. Minimum on a battery should be 12.4 volts. So have battery checked for condition including load test make sure terminal ends are clean and free of corrosion. If battery is low can cause some problems and because of the extra stuff you might try a larger battery in this to handle more load. One with more cranking amps.

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Tuesday, June 20th, 2017 AT 12:04 PM