Help! Leccy problem on an mgb
Turbo Mini Forums

my boss has asked me to get his mgb going, its been stood for a year or so, so went to have a look today

there seems to be 2 6v batteries in series, when i turned the ignition, absolutley nothing happened apart from the tacho needle bounced a little

so wazzed my jump pack across both batteries (treating it like one big battery) and viola, ignition lights

took off the coil ht, and turned it over to get oil pressure, a-ok, plugged it back in, but no fuel was getting to the carb

gave the fuel pump a tap with the bfoh and it clicked into life, and hey presto it fired straight up

now the wierd part, as soon as i took my jump pack off it died

i got the muiltimeter on across both batteries, and its got a healthy 11.2v

tested each cell, and they all have 1.9v or so apart from one which had 1.1v

all battery connections great, getting 11.2v at the starter with ignition on

but when i turn the ignition key, not a thing happenes, no dash lights, no fuel pump, no starter?

but as soon as i stick the jump pack on, everything works?

so if the battery's good, what difference will my starter pack be making? i got the muiltimeter on with it attached and its gives 12.1v as opposed to 11.2v without? would that make such a difference?

another thing i noticed is that when its running with the jump pack, the voltage is still 12.1v, so im guiessing the alt isnt kicking in? could anything in the alt be causing the deadness?


p.s. it has been converted to neg earth, and also has an alternator rather than a dynamo, but these things were done years back and its been fine until now

anyone shed any light on this? im finding it a real headscratcher, and being on painkillers aint helping lol

cheers

joe

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"

One of the batteries will be U/S, put your meter on and as soon as you try and draw anything the voltage will plummet down to naff all. These 6v batteries in MGB's are well known for being shite.

yes batteries common symptoms

I'm pretty sure my dad swapped them for a single 12v battery in the end as these are grief.

In the 13's at last!.. Just

ah, cheers chaps, will get some new batts for it then

hell want to keep it original, so will have to stick with the 2x 6v type, but ill leave a ctek on it

"Turbo's make torque, and torque makes fun"

"did you know you can toast potato waffles?"