Question about ProMariner Battery Isolator 2 Alternator 3 Battery 130 Amp

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I have a mercruiser 260 and wheb i connect the 2nd battery it arcs is my isolator bad

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Check the polarity, it sounds real wrong, the batteries need to be pos to pos and neg to neg.

Posted on Jun 08, 2010


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I have a mercruiser 120 and yesterday while driving on the lake lost all power to everything EXCEPT the power trim works.Any ideas

Remove and clean all connections to all batteries , sounds like a bad ground,power trim wires are only thing getting a good connection .

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Why wont my rv thke a charge

i am asssuming that you are talking about your coach battery bank.are they 12 volt or 6 volt battery system. the arc is a short. check polarity. can you charge the batteries with an external battery charger? if so. then need to check converter output from your mian power panel. there are a few other things to check. need more specifics. and you need to have a volt meter handy.

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No charge voltage to battery. New alternator. No turn signals. This vehicle lost charging when towing trailer.

Troubleshoot by isolating the alternator, then testing for a 13.5 - 16v output (likely to be ~14.5v). Anything out of that range indicates bad alternator or voltage regulator (assumed to be built into the alternator). If voltage is in range, (and following your suspicion of an electrical problem in the Turn Signal circuit), reconnect the alternator and isolate the turn signal circuit by pull the fuses. See if you are getting the good voltage reading of (~14.5v) at the battery. IF IT'S GOOD..check for bad trailing wiring harness (isolate if possible), I've seen bad turn signal bulbs (contacts on bottom of bulb) short out (melt) in their sockets (typically causing a blown fuse..but ya'never know), and lastly you might have to do a hand over hand following the wiring, looking for shorts, melted wire, cuts, broken connections, etc (see Hanes Manual Wiring diagrams for possible points to perform continuity checks). IF IT'S BAD. you must continue to isolate electrical circuits until you find the one that is causing the fault. You can pull one fuse at a time (not reinstalling them) until voltage at the battery returns, or you might try pulling a group of fuses at a time until you can read good voltage at the battery, then replace the fuses one at a time until you find the bad circuit. Once you've isolated the bad circuit, it's either a matter of further isolation until you find the bad component (many circuits supply voltage to multiple components), or checking every connection and component connected in the circuit. Best of luck resolving this problem.

Dec 10, 2013 | 2006 Toyota 4Runner

1 Answer

Reverse gear

Make sure all connections on the rear shift assembly are connected.

Jul 02, 2013 | Mercury Marine Mercruiser 120 140 3.0 470...

1 Answer

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Hi, clean and tighten the battery terminals as a bad connection is the only thing that can cause your problem, regards Phil.

Sep 04, 2012 | Boating

3 Answers

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It clicks repeatedly while holding the key in Start, or just clicks once?
Sounds like the solenoid for the starter is kicking in, hence the click noise, but the starter itself is either stuck or dead.


May 17, 2017 | 2003 Lincoln Aviator

1 Answer

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loose or broken  connection at arcing point

Oct 03, 2009 | 2003 Ford Windstar

1 Answer

Battery Drain when parked.

First off, how old is the battery? It is possible it might be stratified and its just no longer holding a charge well. I've had batteries that are 2 or 3 years old and then they just go dead if I don't start them up every day or so. (Some batteries are just made better than others) If the battery is brand new, then check for some possible wiring shorts. Try looking at the engine running in the dark and try moving around the wiring harness to see if by chance you see any sparks or arcs of electricity. Other than that, you might have to have a qualified auto electric mechanic to check it out for any abnormal power drains.

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