Looking for the "right" Mr. Contactor(s)

[L'Avion]

Condtion inspection time: Have experienced the click--click--grunt--whir & start as others have, am suspecting worn contactor(s), and will pre-emptively replace both master & starter contactor. ---both continuous duty, three (3) pole.

Assuming that master contactor is engaged by master sw that completes circuit to gnd; and that starter contactor requires 12v to terminal to engage, from Cole Hersee link, which part # to use for:

master battery contactor = part #; after some homework part #24115

starter contactor = part #; after some homework part #24106

And, how, where to connect what diodes to each? 3A barrel diodes, per Bob Nuckolls book: page 11-20, figure 11-20; and page 11-21, figure 11-21

Please no suggestions of the four pole contactors; the ones that i am replacing are both 3 pole continuous duty, and have functioned well since 1996 - no reason to change.

[GalinHdz]

Originally Posted by L'Avion

Condtion inspection time: Have experienced the click--click--grunt--whir & start as others have, am suspecting worn contactor(s), and will pre-emptively replace both master & starter contactor. ---both continuous duty, three (3) pole.

Assuming that master contactor is engaged by master sw that completes circuit to gnd; and that starter contactor requires 12v to terminal to engage, from Cole Hersee link, which part # to use for:

master battery contactor = part #; after some homework part #24115

starter contactor = part #; after some homework part #24106

And, how, where to connect what diodes to each? 3A barrel diodes, per Bob Nuckolls book: page 11-20, figure 11-20; and page 11-21, figure 11-21

Please no suggestions of the four pole contactors; the ones that i am replacing are both 3 pole continuous duty, and have functioned well since 1996 - no reason to change.

According to the link you provided, you should place the "banded" side of the 3A diode on starter contactor #24106 post number 2 which is also connected to the +12v from your starter switch. The other side of the 3A diode goes to ground. The picture is just a representation of the starter solenoid.



The master battery contactor (#24115) would not use a diode. I hope this helps.

[Mich48041]

The banded end of an arc suppression diode connects to the positive side of a contactor or relay coil. The other end of the diode connects to the negative side of the coil. On the master contactor, the banded end of the diode connects to the large terminal that is connected to the battery. The other end of diode connects to the small terminal. The purpose of a diode is to protect a switch from arcing that will damage switch contacts. Everything will work fine without a diode, but the controlling switch will not last as long before failure. See Bob Nuckolls' Drawing.
Joe Gores