I was able to determine I had a bad relay on my boat. I could move the motor down but not back up. Switched the relays and I could move the motor up but not back down. The relays are 5 pin 12v 30a relays. I was able to find two different relays. 1 at NAPA and one at Orielly’s. When I installed the new relays, they both just squeal. They feel like they are activating but there is a high pitched squeal coming from both of them. I did get the motor to move up and down 1 time randomly but I cannot get it to work again. Any help would be greatly appreciated.
Without seeing the boat in action, or hearing the described problem, I am going to give you my best guess.
The noise you are hearing is most likely the electromagnet switch inside the relay quickly engaging and disengaging. There could be a number of things that cause this, but if the noise is coming from the relay, that’s my best guess. The way a relay works is, you can use a low current trigger, providing power and ground to pins 85 and 86 of a relay, to create a connection between 30 and 87 (see attached image)
30 and 87 are capable of carrying 12v at 30 amps (normally). With what you are describing, a few things may be happening.
- You have a bad ground for 85, or the switch isn’t supplying enough current for 86.
- The relay you pulled out is configured differently than the one you put in, which means it’s no longer wired correctly.
This is all assuming you’re using a relay that looks like this:
I hope this helps you diagnose the problem further.
Poor connection and a bad relay. I think one of the new relays I got was bad and the contacts at the battery were corroded. I cleaned up the connections at the battery with a wire brush and put in a different relay and it works like a champ. Thank you for the help.