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Why do you think going from a 120 amp to a 70 is going to work ? did you tell Arco you were trying to charge 3 batteries,
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So long as the draw of all 3 bats is not more then 70 amps, the ALT will charge all bats. The only issue is how long it will take. Start bats take a hit when motor is first started but after that the motor doesn't use that much.
I don't see it being the belt, I think its a wiring issue. A voltmeter will tell you what the issue is. With motor not running, measure the post on the ALT as seen in the pic. Only one which will turn ON/OFF is the purple wire https://cimg7.ibsrv.net/gimg/www.off...6e91c3da1d.jpg Orange comes from the starter post thru a 90 amp fuse Purple is Key ON Red/Purple comes from the 50 amp breaker |
Originally Posted by F-2 Speedy
(Post 4702762)
Why do you think going from a 120 amp to a 70 is going to work ? did you tell Arco you were trying to charge 3 batteries,
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Originally Posted by Baja Rooster
(Post 4702769)
The 120a is a car unit that came on the boat. I switched that out to a 75a DB marine unit that corroded into a puddle of rust. The Arco vendor suggested this one. Even with the batteries disconnected I’m only getting 11.5 out of it. |
Thanks for the pointers, AllDodge. A quick check showed that I had it hooked up correctly. I may have found the issue(s). The boat is in a remote storage and a pain to work on especially with a hose. When I checked the output I believe that Arco May have been correct that the brand new belts were slipping but I had already yanked it off. When I put it back on it behaves a little differently but still not charging well. So as I was yanking it off again the positive ring connector came with it. It looks as though there may have only been 2 or 3 strands still intact. Enough to pass a continuity test but effectively charging three batteries with a 22gauge wire. I had not rechecked the output since the first time as it’s such a pain where it is located. All of the batteries are topped off via a charger and everything buttoned up and hopeful that was the issue. I’m not sure when I’ll get to put it to practice though yet. |
Yup, those were the issues. Ham fisted shade tree hack with 20 year old wires. Steady 13.6 at a blip over idle. Thanks for the help as it all helped. |
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