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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Electrical problem 940Views : 15696 Replies : 314Users Viewing This Thread : |
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Mar 17th, 2020, 20:07 | #11 | |
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Seriously, the lead fries itself where you can't see it, the only cure is to renew it, cleaning the ends won't make any difference!
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Mar 17th, 2020, 20:11 | #12 | |
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Ash is a highly qualified auto-electrician, as am i and if both of us are suggesting the same thing then it's a fair bet that's likely to be where the fault is. If you can't renew that short earth strap between the engine and the alternator then seriously take it to a local auto-electrician and report a charging fault - NOTHING ELSE! They will find it from there!
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Mar 17th, 2020, 20:58 | #13 | |
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You obviously have not checked for a voltage drop as Dave advised. You are making random guesses as to the cause. You have been attempting to fix the problem for 90 days and still have not. When advised to seek local assistance, you discard that advice. This is the second piece of advice you have been given and not acted on. All these are indications that assistance by remote control is unlikely to work. What you see in the outline I have written is a process of diagnosis. You should try that. |
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Mar 17th, 2020, 21:38 | #14 | |
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Because it can't output all the current it produces because of the duff earth strap, when the revs drop below 3000rpm it basically back-feeds itself and stops charging again. Sadly we have no idea exactly what load is being pulled when he's dropping that 0.15V somewhere (possibly 0.55V if the reg is cold and should be putting out 14.4V) so it's difficult to make a guess at what resistance is being generated on that link but the resistance will go up as more current goes through because it will get hot. I know you already know all this - just letting a bit off if you catch my drift.
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Mar 17th, 2020, 23:55 | #15 |
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As previously discussed at length in another thread here, I added several additional cables which, together with experts on here, seem to have solved my similar issues:
I bought and fitted a Halfords ready made earth lead from the battery negative to the car chassis. I bought and fitted a Halfords ready made positive lead from the battery to the alternator main + terminal, (and sleeved it), and fitted an additional ground lead from the alternator to the alternator grounding point on the engine, together with an additional ready made Halfords earth lead from the alternator - ve terminal to the same earth terminal on the chassis as the battery. All terminals were cleaned. Together with a replacement voltage regulator and the difference is like night and day.... My existing wiring loom was not replaced, just added to. Last edited by 940volvoman; Mar 17th, 2020 at 23:57. Reason: Text |
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Mar 18th, 2020, 00:36 | #16 | ||||
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Thats where the "below 3,000rpm" bit doesn't make sense if hte fault is ONLY the earth strap. I expect there are at least two problems. Quote:
On a separate issue, stay safe folks - I'm currently trying to figure out how many of 800 staff I still have jobs for... My advice is isolate, and drink only good whiskey. |
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Mar 18th, 2020, 10:06 | #17 | |
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I'm wondering if the classic mistake has been made of connecting the warning light wire to the "W" terminal. Either way, we won't have any progress unless and until that alternator earth strap is renewed as any test results will be nonsense.
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Mar 18th, 2020, 16:08 | #19 | |
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Mar 18th, 2020, 17:05 | #20 |
Getting on a bit
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Thats what its like on here sometimes, every one means well tho
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