Thread: Electrical GURU's I need your help

Can you see if the problem comes thru the ground side of the charger? Hook up the positive and leave ground unhooked and try this. Repeat with the power lead.

One lead is easier to fix than two. I have heard of this type problem before. Never heard the fix.

Ground side being the negative side of the battery being charged.

You can disconnect the charge cable via switch or by relay or by lead quick disconnect. These options will fix it. What you wanna do?

Do you have room for a second charger ... ??

Rickie

Switches are cheaper than chargers. You can use a switch remotely to operate a relay(s) to switch lead(s) or you can just use an wall 12v charger and plug it in and operate relays when you plug your battery charger in. Cheap fix either way. Disconnect or direct switch at lead is cheaper, but PIA.

I've got the same interference on mine Tommy. When you figure it out, just let me know what you find. I've been ignoring mine for the most part, but it does need to be fixed. I suspect it is either the on board charger or coming back through the US2. Both of these would be real easy to check. My plan was to pull the fuses between the starting battering and the charger. If that doesn't fix it I was going to disconnect the US2 transducer. If I beat you to finding my problem, I'll let you know. I suspect they will both be the same thing.

I ran a 18 gauge wire to the TM case to fix my us2 problem. This works best on most TMs. There is a lot of EMI being generated by commutation and PWM with no where to go (unless you have US2 which is another problem). The on board charger probably has a ac signal sneak path back thru the current sensing which would need to be open air isolated via disconnect.

My opinion and Ima sticking to it.

Well i checked with just power (+) connected and it did same..not as bad, but still present.
Im thinking of the quick disconnect from charger......

Would this work? Just wire up charger leads to one end then other end to battery....unhook when fishing when back just reconnect when charging others

Tommy, that should work good for the power. I've been thinking about what Tom said about the relays, and if it is the charger that is the problem, I'll hunt up a 12vdc wall transformer and put normally open relays on it. When I plug the charger in, I'll plug the relay transformer in at the same time. Are your units networked and are you using the US2 transducer on the trolling motor?

If mine happens to be the US2 transducer, I'll add an external transducer to see if it will help. I've been on the lookout for another HDSI transducer anyway. I just hate to pay $200 for the transducer alone. When I think about 200 bucks for a transducer, I'm thinking I can sell the 798, add the 200 bucks I would have spent on the transducer, pay this much down on a brand new 1199 and then finance the rest of it for $19.99 a month for 7 years.

Is yours doing it out of the water?