2002 100 series Landcruiser charging delay

Gary
Two things I can think of.
1. If it does it after a cold start it may be the intake heater current drain keeping the charging from happening until it switches off. That can be verified by having a multimeter reading the heater solenoid output terminal, and if it shows it switches off at the time charging begins, then that area needs looking at.
2. The alternator may have blown a diode which will reduce it's output by 2/3rds which will greatly slow it's ability to bring up the voltage of the battery, particularly if the intake heater is ON . Therefore the regulator won't be getting much rotor field current if its a exciter diodes are also compromised. If you switch on most appliances when charging is happening the alternator should hold a good healthy voltage, ie, 12.6v . If not , then the diodes are not good and healthy.

PS. Are the batteries fighting each other. ie. Duelling? OR does it have DUAL batteries as in 2?

Garny

You are describing exactly what happens when the Alternator brushes get sticky or are nearing the end of their life. Time to get an alternator overhaul or replacement.

What you are describing as a duel battery setup is nothing more than both batteries operating as one, and was just a matter of Toyota using cheaper batteries. It is easy to fit a better battery to the left side for starting purposes only, then fit a VSR to the right side battery which can be fitted with a deep cycle battery.

Regards
Athol

If its diesel, check the plug into the alternator, which are known to become loose in the connections

Hi Garny,
RMD is on the money, after a cold start the alternator is disconnected from the rest of the system and all of its output goes to the intake pre heater, to help reduce emissions,about 60-80 amps at idle and over 100 with a few revs.
Meanwhile the battery supplies everything else and sits between 11 and 12 volts, after up to a minute the alternator transfers over to its normal duties and the system voltage then increases to around 14 volts.
The fact that the warning lights stay on during this preheat period appears to be a separate issue.