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non-turbo 850 fuel pump relay ballast resistor

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Joined: Mon Mar 21, 2016 11:00 am
Year and Model: 1998 V70XC
Location: Illinois

non-turbo 850 fuel pump relay ballast resistor

Post by ordgoyo »

Can anyone tell me what and why there is a ballast resistor in the wiring for the non-turbo 850? it seems to piggyback from the 87b terminal
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Re: non-turbo 850 fuel pump relay ballast resistor

Post by Ozark Lee »

What year is the car are you working on? There are two versions of the fuel pump relay. On version (the common one) has four pins and the other version has five pins with a large and a small terminal off of the 87 position. I have used the 4 pin relay in the 5 pin socket and it works just fine. I never dug in under the fuse box to see what the difference was. If there is a resistor there it would likely server as a current limiter to protect the wiring in the event that the pump shorted out. I don't think it is mission critical but I would need to see it in the schematic to verify that.

'94 850 N/A 5 speed
'96 Platinum Edition Turbo
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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