87 BII 4.0 swap daily driver need wiring help fast please..

[Danno87]

I keep blowing marker lights too

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[trail B2]

My fuel gauge never worked right I just adjusted to it.Full was half and half was a quarter.The sending unit and gauge are not synced at the same ohm scale.

As for the marker wire the brown wire circuit unplug every thing and then start plugging it all together might help figure where it is.

 

[Danno87]

Will the explorer fuel sending unit work with a b2 tank?

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[Danno87]

Anyone?

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[Danno87]

I can't find dimensions on the explorer unit vs b2 unit

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[JJ Black]

The sending unit is not going to be a direct swap due to shape and volume of the tank. I would first check to see if I had voltage to the sender, and a good ground. From the look of the wiring diagrams the sender uses a different power supply than the pump, but i can't make out the fuse number on the drawing. If you need to look at some of the wiring I've got a 86 & 90 B2 and a 92 & 94 exp and I'm 20 miles south of Livingston.

 

[Danno87]

I'll go out and do some testing on it today. See if I can't come up with something. I'll check for power and a good ground. Wouldn't the splice of the wires change the ohms?

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[adsm08]

If done correctly splicing wires will not increase the resistance of a wire.

 

[JJ Black]

Another possiably is the instrument voltage regulator is bad. This feeds power to the fuel, oil, and temp gauges. It could be tested by pulling the lead off the oil &/or water sending unit and grounding it out while seeing if those gauges work. The regulator is mounted on the back of the instrument cluster, a little silver can about an inch long & half inch wide, just snaps on to the mylar circuit board. If I remember right in drops voltage down to around two & a half volts. If you go over to 'Broncoiicorral' they have a few more ecectrical drawings than here. Just click on the sponsor logo and it should take you there.

 

[Danno87]

All other guages seem to work great. But after putting gas in the truck it went from pegged full to empty and I'm starting to think it's reading backwards. Is that possible?

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[JJ Black]

Ohms/Resistance
(Empty/Full)



Found this on a different site, if it's correct it could explain the backward reading if you used the explorer instrument cluster. I would say you have three choices, 1) use is , fill the tank before it gets to the full mark. 2) replace the gas gauge in the cluster to the bII gauge, or 3) replace the sending unit to an explorer one which would need modifying to work right due to different tank size. Haven't seen any comments about this in the swap acticles so not sure why you are having the problems with it.

0-90 Ohms most GM cars, 1965-up
73-10 Ohms pre-1989 Fords & most Chryslers
240-33.5 Ohms Industry standard, works on many popular cars
0-30 Ohms most pre-1965 GM cars
16-158 Ohms most '89-up Fords

 

[richard booth]

I did the swap and used the chiltons manuals for both vehicles, they are mostly the same colors and it takes a test light and a lot of patience but you will prevail, keep on keepin on bro it is worth the toil when you put your foot into that 4.0 you will be stoked!