1969 E Type Jaguar with charging problems.

[slyfox]

And still the alternator cant deliver 14 plus Volts?

 

[DuaneMHunt1976]

Would led bulbs reduce the drain on the battery

 

[slyfox]

Headlights off and fuses pulled. minimal load, just engine running, volts 13.6 and don't increase with revs.

 

[ruston]

Long shot , but are the earth straps sound .

 

[slyfox]

I thought I could rule out the earth straps as I have jumpered the alternator body to battery negative. But I will look at those next.

 

[slyfox]

ACR may not exceed that?

Sorry, what is ACR?

 

[ruston]

Sorry, alternator current rating , but you gave it in a subsequent text.

 

[ruston]

Have you checked for drain , if the car is standing the battery may be playing catch up all the time , especially if it is not a first time starter.
Not all circuits may be fused, drawing the fuses may not isolate a current draw.

 

[shanky887614]

Have you checked for drain , if the car is standing the battery may be playing catch up all the time , especially if it is not a first time starter.
Not all circuits may be fused, drawing the fuses may not isolate a current draw.

just to add the radio might have a feed direct from battery and local fusing

 

[PEG]

Hi dude,What load are the headlights pulling,and where are you measuring the reduced voltage?

If the change in alternator did not work,maybe there is a drive issue...it would be the first Jag i ever seen,without an oil leak...:smile5:

If you have a worn/incorrect belt,loose pulley on either alternator or crank,you would get the symptoms you describe.

A change of alternator with no alternator fault,would point to another defect.

 

[HandySparks]

Might be worth getting hold of a DC clamp ammeter to give a more comprehensive picture of what's happening. They are available from about £40.

 

[slyfox]

Hi Guys, Thanks for all the replies. Last night I bench charged the battery to full indication. Then in the car the alternator voltage measured across the battery rose to 14.5 but rise was slow I that means anything? Voltage drops to 13.2 when the radiator fan kicks in. drops further to 12.7 when headlights are on. The head lights are 60/50 Watts when originals are 50/45 Watts. Also the rad fan is not original. I have tried another battery from my 2005 Mini with same results. Could it still be the Battery or are the Rad Fan and lights ratings too much?
Regards, Greg

 

[ruston]

It could be that the battery does not have enough reserve capacity , especially if it is not getting enough running to keep it fully charged.
A mini battery would be undersized for an E type. Something around 80 - 90 amp hour might be more appropriate.
As has been suggested by me and others calculate your total load and clamp test the starting current . This will give you an idea of the alternator output and battery reserve you are looking for.
If it has air conditioning added ,along with cooling fan you will have a heads start to draining the battery, and as I said earlier if it is a bad starter it will hammer your reserve.
Also as Peg said make sure the running gear is good, if it is slipping you have no chance.

Ps , just had a quick google 61 to 79 e type is 70 amp hour.That will be for standard equipment.

 

[slyfox]

Ps , just had a quick google 61 to 79 e type is 70 amp hour.That will be for standard equipment.[/QUOTE]

Tried new 70 Amp Hour battery and no difference.

 

[shanky887614]

Ps , just had a quick google 61 to 79 e type is 70 amp hour.That will be for standard equipment.

Tried new 70 Amp Hour battery and no difference.[/QUOTE]
have you checked the pully/linkage to power the alternator?

is the alternator outputting the right amount of amps?.

is anything on the car non original, anything electrical it doesn't matter what it is.