Swap the ECM's from side to side,
see if the idle condition follows the
ECM

just a thoought.

jt

Good info guys....I will pass the info on/have him log on. The swap is a good idea !

I have a pair if 1999 500hp's (carb). The alarms go off after a hard run, then quiet after a couple minutes at idle. Both engines do it. All gauges show normal, and drive bottles are full. I'm stumped! I unplugged the drive bottles....didn't help.

What now???

Help?

If your gasket is missing on your outdrive res. cap, it'll throw the oil out at rpm (due to pressure). ie: if you have oil in the bilge... that's most likely your problem.

i'm not a mechanic, so hopefully my "non-techie" comments were understood.

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire or connector.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire or connector.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire, connector, or best bet --alternator.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.