So, I bought a mk1 NA at the weekend and had a couple of electrical issues. It cranked fine then suddenly stopped turning over. Thus far I’ve replaced the - battery, main fuse, spark plugs. I get dash lights and headlights (I’ve removed the radio for the time being). I do get a battery warning (battery is new and fully charged) and it seems to drain as soon as I attach it. Any help massively appreciated
Possibly the starter itself? You mention it has a couple of electrical issues so assume not cranking is one. What are the other electrical issues as these may well be connected?
The other was the radio itself (not fantastically fitted and wasn’t grounded) .
Turn the ignition and it sounds like its going to crank but somehow can’t make it over the line — turn the key and it just kind of stutters. I’m thinking alternator at the moment. I’d searched the forum and found similar (but not quite) descriptions hence me doing the “rule it out list”. The fuel gauge is just shy of empty could it be misreading it and is actually empty?
Nothing to do with the alternator - that keeps the battery charged once the engine is running. You say the battery is fully charged.
I would be investigating basic electric feed leads (positive and negative) in the boot. Check all earths. Then move to starter motor itself, and supply to it.
Get some petrol, and try again. If you have a multi-meter, Disconnect the battery negative lead and check on the resistance scale that there’s no direct reading (zero ohms) between Positive lead and chassis. What battery are you using? If it goes flat immediately you have a major problem. You need an Auto-electrician to check the electrics out - unless you are good at electrics yourself? (Not many are, so don’t feel bad about it.)
Check that the main earth lead from the battery negative terminal to where it joins the body hasn’t got a load of broken strands of wire in it, this can cause a massive voltage drop when cranking.
Couldn’t see any fraying. Replaced all fuses I can access. Battery is a vpower 063vp, I’ve also got a yuasa 1000.petrol topped up. Still no joy getting it started :/. Starter motor may be fried going off what others have said
How many volts across the battery terminals at rest ? It’ll tell you the state of the charge. If it’s 12+ volts, you’re issue is likely to be an earth problem. If it’s less than 12v you’ve got a discharge issue or sulphate battery. Discount the latter as you’ve replaced the battery recently.
A faulty rectifier on the alternator can cause battery drain, quite a quick one too, and a loss of output which will bring your charge light on sometimes…
Been waiting for a new starter motor to arrive so have had an impromptu break from it. Am now just waiting for some axle stands so I can properly investigate - either rectified or more questions this weekend :)
So, this is embarrassing. Got my brother-in-law over (mechanic) as I was drawing an utter blank and talked him through it running and then not. There’s a switch in the arm rest box…it isn’t for the aerial as thought…its a bloody immobiliser!