Trade 105 for a 140 alt? - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

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Trade 105 for a 140 alt?

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Old 01-28-2008, 11:31 AM
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Default Trade 105 for a 140 alt?

Can you trade the 105 amp alt for the 140, showes difference is heat windsheild, anyone know if they trade out or not.. Thanks again
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Old 01-28-2008, 11:45 AM
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Wait for Wilren to reply. I believe he swapped his out for a 160 or so.
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Old 01-28-2008, 11:47 AM
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Yes, they can directly swap. However, the battery terminal for the 140 amp alternator is bigger, so you will either have to make the existing cable terminal hole bigger, or cut and splice a new cable terminal.

EDIT - Waitaminut. Which car are we talking here?? My above statement is applicable to S1s.
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Old 01-28-2008, 11:55 AM
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You will have to REPLACE the entire feed to the battery with a larger gauge, which will also require a larger lug at the alternator. I use my top terminal on the Optima for that purpose.

You will also have to extend the single-wire regulator harness by about an inch or two. The connector on the 140 case (what my 160 was built from) is in a different spot and your factory connector, if it reaches, will be very short. So short that upon decelleration, as the motor rocks forward, it may rip it out.

The cas is physically larger, but can just barely be installed and removed without removal of the STB.

I would suggest a 125-amp first. It'* a direct swap.
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Old 01-28-2008, 01:16 PM
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on a Series 1 L27 (which is what the OP has) that is a incorrect statement

i had no problems when swapping my 105 Stock Alt, to a AC Delco 140 Amp. The Terminal bolted on, and the Harness plugs in with room to spare. Over 30K miles and never an issue.
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Old 01-28-2008, 02:12 PM
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I don't think any statement made here truly hits the nail on the head. The L27 mounting (at least mine) needed the battery terminal widened, but the harness connection was spot-on. The L67 (when I had it on there), well, that is unknown since I run my custom cables and I went big to start with. But if memory serves I did have a little tension with the harness, but I cut back some of the tape and looming and got a little more play out of it.

Wren is right on running the larger battery cable though, in order to get the most potential out of the alternator.

What IS known is that the 140 will physically drop-in with no modifications. But as we have seen just in this thread, there *may* be a need to modify cables to some degree.
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Old 01-28-2008, 05:59 PM
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Originally Posted by 1993 SLE
on a Series 1 L27 (which is what the OP has) that is a incorrect statement

i had no problems when swapping my 105 Stock Alt, to a AC Delco 140 Amp. The Terminal bolted on, and the Harness plugs in with room to spare. Over 30K miles and never an issue.
All eye gouging out of the way, went with a 140, it fit great, did extent wire a bit, I already have 2 gauge wire ran, from point a to b, for system in trunk, now cap is reading 13.89 pretty much solid so it works, thanks to all of you for your input and ideas.
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