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Volvo 850 Jumping starter with cooling fan out

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
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1997 - 2000 V70, V70 AWD
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JimBee
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Volvo 850 Jumping starter with cooling fan out

Post by JimBee » Wed Dec 14, 2016 10:01 pm

Cold weather brings out the gremlins. Now my starter won't turn. Battery is good. The last couple of days starting had been sluggish, so it might well be the starter. Now it's not responding to key on start so I need to directly test the starter.

I just want to be sure that I'm doing things electrical correctly.

To be safe on a manual transmission car, we need to be certain the transmission is in neutral if we're going to try to just turn over or start the engine while standing in front of the car. Or with auto trans, locked in park.

So, there are 3 wires on the starter: Major red cable directly from battery; small green wire which has a spade connector and apparently sends current to the solenoid from the key switch in start position III, and the small wire that is connected on a threaded pole secured with a nut that presumably powers solenoid which then carries full battery power to the starter motor.
Right?

So to activate the solenoid to turn the starter, I need to supply 12 volts from the large cable terminal from the battery to the green wire spade terminal.
Right?

Or just touch a screwdriver or something across the battery pole on the starter to the green wire connector.
Right?

A question to ponder: Since the main battery cable carries full battery amperage, can connecting that full shot of amperage to the low amperage green wire circuit backfeed to the key switch and damage it? So would it be better to pull the green wire off the spade terminal, push it aside, and then jump directly from the battery cable terminal to the spade terminal (briefly, especially if nothing is happening).
Thinking this through, with the key switch off or in position II to power the ignition, position III should be an open circuit so putting current to a downstream point on that green wire should not cause any current to flow back to the key switch and therefore no need to disconnect the green wire from the spade terminal. Just don't have somebody turning the key to position III when the jump is being done.
Right?

Also concern: To do this procedure, I need to get some room to work down there so I'll want to remove the fan and shroud. Right?
But to remove the fan I need to unplug it. Would powering everything up to run the engine with the fan unplugged harm anything electrical?

If the starter does respond to directly jumping it, then both the solenoid and the starter should be okay. Then, the problem would more likely be in the key switch.
Right?

JimBee
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Re: Volvo 850 Jumping starter with cooling fan out

Post by JimBee » Wed Dec 14, 2016 10:07 pm

This image shows the wires on the starter solenoid.
https://www.google.com/search?q=volvo+8 ... B480%3B360

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Re: Volvo 850 Jumping starter with cooling fan out

Post by abscate » Wed Dec 14, 2016 11:59 pm

Nice covering all the bases!

1 you don't have to worry about backfeeding the ignition switch. On my 1999, you don't even go the starter, there is a shielded plug to jump the starter in the fuse box . I think the earlier P80s have it some where else or it may be an AT thing.

Found it.
Top left on your wiring diagram shows a jumper wire going to terminal connector 17/1. Notice the way that wire can supply voltage to terminal 50 on the starter independent of the ignition switch. That's the one you want to find

This one bailed me out in oneonta NY , 100 miles from home, when my tailgate wiped out my starter circuit

2 you can unplug the fan and run the car briefly (5-10minutes) with no worries

3 the amperage of a circuit is determined by the total resistance not by the wire gauge. When you apply the 12VDC to the green wire, the resistance determines that about 2 Amp will flow. It doesn't matter if the wire is a small 18 AWG or a fat battery cable.
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Re: Volvo 850 Jumping starter with cooling fan out

Post by abscate » Thu Dec 15, 2016 5:21 am

Reference to location of starter connector on P80

http://www.matthewsvolvosite.com/forums ... =1&t=78989

Jim..if you find it and can take a picture and add it to the first post, or send it to me we can complete this reference
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Re: Volvo 850 Jumping starter with cooling fan out

Post by JimBee » Thu Dec 15, 2016 2:50 pm

My 96 855 does have a female spade-type connector peeking out of the harness in that vicinity. I photographed it and will send the picture later.

My 93 850 doesn't seem to have anything like that. The area right in front of the fuse box on the 93 is very congested with the early version of the ABS system and the harness coming off the fuse box, but I don't see a plug or wire, except for the two small wires that connect to the spark coil.

BTW: How do I edit an earlier post to put in a picture?

Also, can I place a check by a post title to show it's solved—or change the header to reflect that?

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Re: Volvo 850 Jumping starter with cooling fan out

Post by abscate » Thu Dec 15, 2016 2:54 pm

It's the arrow box on the first post or any post for that matter, Right hand side level with the thread title.

The wire is green on Manual trans cars, green /red on AT

If you just post the picture here in a reply, I'll move and clean it up.
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Re: Volvo 850 Jumping starter with cooling fan out

Post by JimBee » Thu Dec 15, 2016 8:37 pm

Okay, here's the picture. As I mentioned, I couldn't find a wire or connector on the 93 850; there is a connector on the 96 but no wire. Maybe that's for something different. Both of those cars are manual trans.
I guess I haven't used this version of the Add File feature. I think I got it in though.
Maybe not, I don't see the image. I tried to drag it to the message box, and that registered in the message center below. Then I navigated to the file and selected it but still not seeing it here. Guidance, please.

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Re: Volvo 850 Jumping starter with cooling fan out

Post by abscate » Fri Dec 16, 2016 4:12 am

After you load the file in the 'add file' box click the 'place inline'

You don't see the 'place inline ' button until it loads
Empty Nester
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1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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JimBee
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Re: Volvo 850 Jumping starter with cooling fan out

Post by JimBee » Fri Dec 16, 2016 6:36 am

In my 96 Volvo 850, is this the jumper plug to activate starter solenoid?
strjump.JPG
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abscate
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Re: Volvo 850 Jumping starter with cooling fan out

Post by abscate » Fri Dec 16, 2016 1:10 pm

That looks like a green and red. If you want to be positive, put a voltmeter on it and see if it goes to 12 volts when you've assistant cranks the motor.
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