Question about 1991 Volvo 240
New alt. batt. when running batt cable off shows 13.8-14.6 v
put cable on volts go down 12.6-lower rev eng. volts go down
using lights / flashers after awhile gets weak / cuttig out
lights dim not enough voltage to run .bat. still shows 12 + volts
will not do any thing /chang batt. start right up ...
i have checked ground post to cable for drain nothing all fuses good
checked wire ends ok with cable on reading at alt is low does not pick
up at rev eng. volts on fuses seam to be good no overload
every thing works fine till volts drain . batt dont lose charge when not
running i am lost /stumped / mindbogled/##$%&**
can you help send e mail email@example.com
14.6 means your voltage regulator or diode is suspect Despite having new alternator .Ive cross refrenced your smptoms in the haynes workshop manual and alternator is your only end answer.The haynes test is to start vehicle with multi meter connected across the battery terminals,increase the engine speed until the reading remains steady should be approximately 12 to 13v and no more than 14v.switch on as many accessories as possible(headlights heater blower radio etc)check that the alternator maintains the regulated voltage at around 13 to 14v.If the regulated voltage is not as stated then alternator is to be repaired/replaced.Good luck with it and a happy new year.
Posted on Dec 29, 2008
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Posted on Jan 02, 2017
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