High Voltage Surge

[CFR__AND_SONS]

(09-21-2016 )Rawze Wrote:  I had a truck that spiked to 15+ every time it rained. We complained about it every time we went to the main terminal of the company we worked for, but they kept ignoring it.

The alternator was the cause, we knew this, but no one believed us.

We went through a monsoon rainstorm one time and it went all the way up to 17.9 volts and burned out all the lights, the dash, and half the ECM. Good thing it was a company truck.

The electric guy was very busy after the rain yesterday.

Turns out that everything is charging as it should. Only thing that we found was a bridge at one of the batteries was not connected properly. So we are assuming that moisture got into the alternator which caused the spike. I'm gonna keep an eye on it and plan on buying a new OEM alternator, although this delco looks fairly new.