Wondering if someone might have some insight. I have a Engine Pane - C (deluxe) which, with the switch on (and also with the engine on) was continually sounding the alarm and tach was not reading. So I replaced the alarm and had the alternator checked (needed a new regulator, which was replaced). However, after re-installing everything, neither problem was fixed as the alarm still continually sounds and the tach still does not read. Any suggestions as a step one in figuring this out?
First check the continuity of the wire that runs from the back of the alternator to the back of the tach. This wire is a thin blue wire with a black tracer and goes through terminal position 6 on the multi pin plug where the panel harness plugs into the engine harness. If this is good and you have about 6 to 8V AC with the engine running, the tach will work if all the terminals are good with no corrosion.
The alarm is possibly sounding because the alternator is not charging (or it is charging but a bad or broken connection is not letting the charge through) so again check the cable from the alternator to the starter and the thin brown wire (with black or yellow trace) from the alternator to the ignition switch. This passes through terminal number 9 on the multi pin plug.
When you are checking these wires, peel back the covers over the plugs on the multi pin harness plug. If you see any corrosion (greenish fuzz1), this must be cleaned off and then make sure that the wire is making good connection into its terminal.
If all goes well you will find the problem with the batteries switched off as you will be using an ohm meter for test purposes. Once all the terminals are clean and covered in a dielectric grease, you should be good.
If the instructions above do not fix the problem, it is possible that the original bad regulator caused the alarm board to fail. Remove the alarm board and replace.
-- Edited by Stanley on Tuesday 7th of February 2017 05:00:14 PM
