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Electrical drop in volts

Tiny
SDIAMOND
  • MEMBER
  • 1995 FERRARI 348 SPYDER
Alternator delivering 14.5v to the battery BUT when the coolings fans come on drops steadily to under 12v which drains battery. Left side fan is about 14A draw, oil cooler fan R side is about 6A, right side cooling fan does not come on at all. Checked with external battery and fan runs fine. Replaced R side fuse and relay for fan, still doesn't come on.
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Friday, June 15th, 2012 AT 4:38 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Alt should be able to handle 14amp load so a load test of ALT will determine if needs replacement. As for oil coller fan it come on when oil temp reaches a predetermined temp so maybe faulty oil temp sender or oil not hot enough to trip fan
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Friday, June 15th, 2012 AT 4:45 PM
Tiny
SDIAMOND
  • MEMBER
  • 2 POSTS
Alternator was recently rebuilt and battery is new. Voltage to battery is fine before and after cooling fan comes on. The right side fan does not come on with the other, (they should) but an external battery runs that fan just fine. With new relat for R side and fuse fine, where is the problem?
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Friday, June 15th, 2012 AT 5:04 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Would take back to who rebuilt ALT cause it is not right as for oil cooler fan I stated possible oil Temp sender
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Friday, June 15th, 2012 AT 5:56 PM

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