89 open conversion aux. fan issues

[david1289]

I converted to an open cooling system and continue to have issues with the fan switch. The switch is a Napa fs113, wired to a relay. Switch will work for a short period of time and then die. When I test the relay, by-passing the switch grounding with jumper fan kicks on. On the relay when I go to ground with a circuit tester, I have a small amount of voltage? I want to keep the automatic switch. Any help is greatly appreciated.

[4.3LXJ]

Have you checked the resistance of the switch and the voltage drop?

[david1289]

No I have not. I have read several write ups on converting and several recommend this switch. Normally open and when temp is reached, goes to ground, relay then reacts.

[david1289]

checked the voltage drop, and resistance. Nothing, another bad switch, number 4. Have a new one on the way, last try with this brand of switch!.

Thanks again.