im trying to install a tach on my 4106 is a isspro tach i need to know the pulses per revolution on the alternator. i have the signal wire conected to thr relay terminal on the 50dn the guy at isspro said it had to be a ac tap is the relay terminal a ac tap? thanks in advance
The 'r' terminal is the signal you need to get to the tach. The generator is a 6 pole device and the ratio on your engine is 2.29-1 So you should select 13.74 pulses/rev or whatever is closest to that.
Regards
Jerry 4107 1120
Note 1 ->For Detroit Diesel Delco gear driven 50DN
270 Amp 24 volt alternators "R" Terminal hookup
The "R" terminal output is 12 volt -
Most 6V92TA's are: (2.93 gears & 6 pulses per Revolution=17.58 pulses/rev)
Older 6V92's can be(2.75 gears & 6 pulses per revolution=16.5 pulses/rev)
Older 8V71's can be(2.29 gears & 6 pulses per revolution=13.74 pulses/rev)
I used a pulse generator that was installed on the tach drive off the blower. Good Luck, TomC