Mark579

Hi Wotever, definitely have taken both Ditchcrawler and Tony's posts onboard. Both suggest alternator probs so currently both alternators are in the boot of the car ready to be looked at tomorrow. It's tricky trying to express issues on a forum in a text cos of all the ins and outs. I know a bit, but not enough, and I took Tony and Ditchcrawler as a consensus on the alts! Since Sunday I've replaced an exciter, a relay and measured all sorts, and was still stumped. The info on here is invaluable and I properly appreciate everyone's response, so I apologise if my posts haven't seemed grateful. I definitely am grateful though! Just been curled up in an unnatural position for a while removing alternators..??

Yes but the relay has not connected, so I'm assuming the readings were independent? This is where I start to struggle tbh! I'm gonna whip the pair of them out before it gets dark. Might do the alternators too. Ho-ho. Sigh.... Listen, thanks for your help! Take care!

Voltage readings taken as 12.5+ on both starter and domestic before starting the engine then 14.05 on both when the engine was in idle. Then it cut out and went back to 12.5+ while the engine was running. Took the readings from the battery terminals because trying from the alternators gave mad fluctuations. I'm about armpit deep in terms of understanding at this point...?

Thanks Tony, currently at 78% on the domestic side according to smartguage (had the problem since Sunday night though), not sure on the starter battery because it's the supplementary. Belts are deffo not loose. Performance over the winter has suggested bthat the batteries were due for renewal soon. Was going to take the alternators off to a place near by for a freshen up, but if it's the batteries...well best dig me credit card out

Hi, I have a twin alternator set up (with a Merlin battery management system) to charge 1x110a starter and 3x110a domestic batteries. The alternators are sometimes charging (14.05ish volts on the multi-meter for both) and sometimes not (12.5 - 12.8ish volts for both). Any ideas on what would cause them both to stop charging while the engine is running?