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The 92 and later Volvo 740 and 940 Turbos usually came with Bosch 100 amp alternators that were a little stronger than the Bosch 100 amp alternators used on 88-91 Volvo 740 Turbos. The later alternators are 55/100, meaning they put out more amps at lower rpm. The earlier alternators are 31/100, meaning they put out about 31 amps at 1500-2000 rpm. I have heard that the 1995 Volvo 940 Turbo came with a 140 amp Denso alternator.
Any of these alternators should fit, though minor rewiring might be necessary. If you have a 240 Turbo with the alternator mounted down low on the exhaust side, you may have clearance problems with at least some of the larger Bosch alternators. If so, you may have to relocate the oil pressure sender using bits of pipe and connectors from the hardware store.
Note that the Volvo 2/7/9 alternators are all clocked the came, meaning the mounting holes are in the same positions. Many Bosch and other alternators on other cars use a different clocking, often 6 am and 12 pm. Many other alternators also use a different footing, like two lower mounting points rather than one, and may not be easily compatible.
At www.turbobricks.com in the forum, in the articles or vault section, there are instructions on how to adapt a 1980s Chevy alternator to most Volvos. The advantage of doing this is that you can easily get 140 amps and you can easily get 60 or more amps at very low rpm. You can buy these new or used, stock or modified, on Ebay, as well as modification kits. Summit and Jegs also sell them. I believe they are called the CS series and are made by Delco.
The most common complaint of poor alternator performance is too few amps at low rpm. Relatively few mods are available for the Bosch alternators used on Volvos. You can buy adjustable internal or external regulator that will increase and steady the output voltage. You can also redo the main power and ground wires. These improvements help, but won't bring output from 15 amps at idle to 30 amps at idle. You need a higher output alternator that is also rated at higher low rpm output.
Philip Bradley
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