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Old 05-20-2019, 07:08 AM   #1
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Help Delco alternator wiring

Hello everyone I need some info. I have a 2000 dynasty Iím in a pinch and the only alt I can get by tomorrow is a 28si. I know there are ppl who have used these before. I need help on how to wire it because they donít have Duvac on them. Any advice will be greatly appreciated
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Old 05-20-2019, 07:12 AM   #2
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Here's the info your looking for.
If you have the Duvac then you just need to connect the "Remote Sensing wire (the "S" terminal)" to the Duvac. The instructions say the Remote Sensing terminal (S terminal) is "optional" so if your replacement alternator doesn't have it - send it back. However looking on-line at places that sell the 28SI have not yet seen one listed for sale that did not have the "s" terminal.
Good luck.
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Old 05-20-2019, 07:34 AM   #3
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Quote:
Originally Posted by CountryB View Post
Here's the info your looking for.
If you have the Duvac then you just need to connect the "Remote Sensing wire (the "S" terminal)" to the Duvac. The instructions say the Remote Sensing terminal (S terminal) is "optional" so if your replacement alternator doesn't have it - send it back. However looking on-line at places that sell the 28SI have not yet seen one listed for sale that did not have the "s" terminal.
Good luck.
Bare with me so my leece Neville has a duvac on it correct? If I buy a 28si it wonít correct?
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Old 05-20-2019, 07:57 AM   #4
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The Duvac is a separate unit. The alternator type doesn't matter as long as it has the "sensing terminal".

Looks like this - the blue box (sorry top photo is rotated for some reason).
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Old 05-20-2019, 08:02 AM   #5
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Ok I understand that now. One other question do you mount the fan on the 28si?
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Old 05-20-2019, 08:05 AM   #6
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No on the fan. The Delco 28SI has an internal fan.
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**Beaver History/Info/Chassis/Suspsn https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
**Bvr/Mnco Wiring Diagrams (84-09):https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 05-29-2019, 08:47 AM   #7
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Thank you to everyone that helped me with alternator issues. In the end my leece wasnít worth rebuilding so Iím taking my chances with the delco 28is. A thousand miles on it and itís still working.
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Old 05-29-2019, 10:58 AM   #8
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The Delco 28SI is a better alternator than the LN. You'll be fine.
Enjoy
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**Beaver History/Info/Chassis/Suspsn https://1drv.ms/f/s!AtvAXw_lfqbToxXYREK9YdBP08Jn
**Bvr/Mnco Wiring Diagrams (84-09):https://1drv.ms/f/s!AtvAXw_lfqbTm0WTuuNqpn9a8hCh
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Old 08-03-2019, 01:40 PM   #9
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Duvac replaced by 28SI

2000 Dynasty ISC 350HP

Original DUVAC 200 amp alternator

Changed DUVAC to 28SI (200 amp.) Encountered situation where connecting the Remote Sense, IGN and relay wires caused engine to continue running with IGN switch off. Disconnecting IGN wire shut down engine. But when started again, Tach would not work.

Ended up putting a relay between IGN and engine. Reconnected all wires and works fine.

Note: "Relay" connects to Tach (gray wire) and is 6 Volt output. "Remote Sense" (connects directly to battery,) and "IGN" are both 12 volt.
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