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Regrding my earlier post about the alternator seeming to stop charging with the car idling with no load on the battery. I came across this post on another forum. The PDF is not accessible but the operation is explained. Honda for the most part uses DENSO alternators with internal regulators...

That brilliant. Looks like we have a figure to work to, if anyone else gets a problem. Beefy said a maximum of 30ma but now we have two cars showing 24 - 25 ma. Just need to make sure alternator is keeping battery fully charged now.

I'll watch it over the next week or so I guess I'll have to get some croc clips and make some leads up for the watt meter.

Btw just put the code reader on the car. Nothing showing. That eld unit throws a dtc if it's faulty.

Yes it would be better to test with hydrometer but it's a sealed battery. Damned manufacturers again.

Good diagrams. Looks like the "ELD" unit controls charge. I have no idea where that is. I think that the voltage sensors for the charging must see the battery at 12.6v as "full". Because as soon as I put the sidelights on - causing a fractional voltage drop on the battery - the alternator kicked...

Just had a look at alernators and they have a clutch/pulley ? Why and how does that work, I have noticed a whine for the first 10 minitues or so after starting.

Hi again, Checked the battery voltage again this morning. The car went on a 2 mile run yesterday with 3 stop/starts and idled while it warmed up for me to check the alternator output. Battery reading this morning 12.62v. Thats a drop of only 0.02 volts in 24 hours. That looks better. Yesterday I...

Just had a look in the handbook - for what thats worth and it recons Fuse 7 under the dash is for "back up lights". Thats confusing. Can anyone confirm the diesel fuse uses please.

It may tell us everything we need to know, including the fact that Honda squezed too small a battery in when there's probably toom for a tray for a type 100 there, but can we do anything about it. LOL Thats the one I ordered.

Btw freddofrog I just bought on of the meters. It will come in handy for a lot of things.

Oldcruiser. No not me with a sensor issue. Seems there isn't one on the Accord cdti

LOL. Anyway done some tests this afternoon, some easy to explain others not. Alternator tested - as instructed. 2000rpm, hot, Dipped beam - 14.32v, Main beam - 14.27v. That sounds OK to me. Fuse pulling excersise. Fuse 7 Underbonnet - 6ma. I think thats the control block. Fuse 15 Underbonnet -...

I would have thought that but it flattened my battery in 10 days. Only thing could be that the battery wasn't full when the car was left. Want to be belt and braces not to get problem when airport parking. Will check alternator output later.

Ffredofrog. Found some instructions. Think it's a similar monitor. http://www.rc-cars-planes.com/docs/wu100v2_user_manual.pdf

Thanks for the suggestion. No besides being a higher capacity it's physically bigger. But I could get one the same 80ah rating in the right size case if push comes to shove.

Interesting. The car always shows 14.2 to 14.4 volts on the voltmeter when driving. Will try it with the headlights on tomorrow.

Thats a curve ball !!! Why would the car be overcharging ? Don't know of any way to check short of putting a proper ammeter in line with the battery positive lead. It would have to be a high reading one as I think the alternator is rated at around 120A. By the way that meter is also on the bay...

That little meter looks interesting wish the manual was available Duh ! Read a lot about batteries on the net and that "Peukerts Law" nearly did the old brain in. Will keep volt monitoring and may try that meter, but am definitely going to probe the fuses when the lead gets here. It was...

Hi both. Been monitoring battery voltage for a while now. After reconnecting the battery it dropped 0.2 volts in the first 24 hours. ( Would that be the residual charge coming off ? )12.99 to 12.73v Over the last 7 hours it's only dropped 0.01volts. (Hopefully it will stay like that ) From the...