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Isolation Relay

 
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA
PostPosted: Mon Jul 16, 2012 8:59 pm    Post subject: Isolation Relay Reply with quote
I am looking for an isolation relay for the firebirds with the 3 relay 3 wire motors (?-87).

Mine is hosed and Baxters want $150.00 for a new one. I will not have time to hit the yards for about three weeks, so if someone has a parts car they could really help me out.

These seem to be worth about 10.00 used on TGO.

Thanks a bunch. Also everyone who said "replace/rebuild your motors" Very Happy
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86' firebird (Junked in 2015). 88' GTA (sold in 2020).
aaron_sK wrote:
Hell, Tony drove his GTA to Cows a few years back with the pickup coil that came out in pieces.


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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z
PostPosted: Mon Jul 16, 2012 9:07 pm    Post subject: Reply with quote
Umm...

If this is a thing:

http://www.thirdgen.org/techboard/attachments/electronics/76954d1091671917-3-relay-firebird-headlight-he1.gif

Then all you need is a 12V DPDT relay and a connector.

Last edited by aaron_sK on Mon Jul 16, 2012 9:46 pm; edited 1 time in total
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA
PostPosted: Mon Jul 16, 2012 9:26 pm    Post subject: Reply with quote
really.. do you have a diagram of how that relay works inside? for $150 i'll rewire the connector.
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iansane
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Joined: 16 Jan 2004
Posts: 5740
Location: Bothell

1991 Pontiac Trans Am
PostPosted: Mon Jul 16, 2012 9:35 pm    Post subject: Reply with quote
That link shows how it works. The center relay setup.
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aaron_sK
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Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z
PostPosted: Mon Jul 16, 2012 9:38 pm    Post subject: Reply with quote
Looked around a bit and can't seem to find a reliable source of the double pole relays in either a single or double throw configuration.

In the interest of doing this cheap and easy I would wire two five-wire relays on each side and jump the coils together.
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA
PostPosted: Wed Jul 18, 2012 8:11 pm    Post subject: Reply with quote
that looks like it would work. thanks. ifod a few places with dpdt, but they are sketchy
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aaron_sK
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Joined: 23 Jan 2006
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z
PostPosted: Wed Jul 18, 2012 8:34 pm    Post subject: Reply with quote
Xophertony wrote:
few places with dpdt, but they are sketchy


Yup yup

I was not able to source anything other than a SPST or SPDT from any reliable electrical supplier.

The only thing that worries me about replacing it is some of the routing and what appears to be a diode inline between the yellow line wire. It looks like maybe the are trying to feed the pink load wire with both of the lines when the relay is open and the diode is there to prevent the switch from backfeeding itself? Confused

Regardless, it can be duplicated or possibly removed. Is it possible to pop the old unit apart and probe it with a meter to see how it's wired?
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Xophertony
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Joined: 13 Oct 2005
Posts: 5304
Location: Portland, Oregon.

1988 Pontiac GTA
PostPosted: Wed Jul 18, 2012 8:50 pm    Post subject: Reply with quote
i ordered 40 amp relay so the single feed should be enough to power everything. i'm just going to leave that part out, see if it still works.
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aaron_sK
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Joined: 23 Jan 2006
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Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z
PostPosted: Wed Jul 18, 2012 8:59 pm    Post subject: Reply with quote
You could try building jumpers from the existing connector to the new relays to test the functionality of it before cutting.

Shame you're not closer or I'd tell you to bring it by the shop. I really enjoy this sort of thing, which is good seeing how I always end up with all these electrical projects. Laughing

BTW, I drew up a quick diagram. Stock wire colors except for the orange and grey which will be your wires to jump the new set of coils.
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