At idle I'm getting 16.2V at battery with rebuilt alternator

1546 Views 4 Replies 5 Participants Last post by Dan_UK_1984, Sep 10, 2009

ronstory

Discussion Starter · Aug 15, 2009

My mechanic just replaced the alternator on my LWB 10 days ago when I discovered my lights were a bit dim and the voltage at the battery was 11.8V. Ouch! I made sure the battery was topped off with a normal battery charger and the voltage at idle was 14V. Woo-hoo problem solved.

Now one week later, i notice going down the freeway the battery light came intermittantly (5% of the time) and I would lose the tach signal (dropped to zero RPM). However, then the battery light would flick out and the tach was fine plus the engine ran fine the whole time. So I just got home and immediately measured the battery at idle and got 16.2V. Yikes!

Did I get a bad alternator?

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jonket

· #2 · Aug 15, 2009

Re: At idle I'm getting 16.2V at battery with rebuilt alternator

Very likely you have to have the voltage regulator exchanged. Should not go much over 14.6 volts.

Too high voltage and your light bulbs will start to burn up plus boiling on battery

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slvdc1

· #3 · Aug 17, 2009

Re: At idle I'm getting 16.2V at battery with rebuilt alternator

All I can think of is to make sure your connections at the battery are clean and tight. Other than that...I'd take it back to the shop and have em put another on in :thumb:

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hilleng

· #4 · Sep 2, 2009

Re: At idle I'm getting 16.2V at battery with rebuilt alternator

too much voltage mate!! u have a fault on your alternator as the rev counter relies on one phase from the alternator to get its frequency. just take it back if you havent already and get it checked before it damages the sensitive circuits .
:hand:

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Dan_UK_1984

· #5 · Sep 10, 2009

Re: At idle I'm getting 16.2V at battery with rebuilt alternator

Agreed with all of the above, but do the idiot checks first. All cables on the alternator and at the battery.

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